MC68HC908GR8 MC68HC908GR4. Technical Data M68HC08. Microcontrollers. MC68HC908GR8/D Rev. 4, 6/2002

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1 MC68HC908GR8 MC68HC908GR Technical Data M68HC08 Microcontrollers MC68HC908GR8/D Rev., 6/2002

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3 MC68HC908GR8 MC68HC908GR Technical Data Rev.0 Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. "Typical" parameters which may be provided in Motorola data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer s technical experts. Motorola does not convey any license under its patent rights nor the rights of others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer. Motorola and are registered trademarks of Motorola, Inc. DigitalDNA is a trademark of Motorola, Inc. Motorola, Inc., 2002 MC68HC908GR8 Rev.0 Technical Data MOTOROLA 3

4 Technical Data MC68HC908GR8 Rev.0 MOTOROLA

5 Technical Data MC68HC908GR8 List of Paragraphs List of Paragraphs Table of Contents List of Tables List of Figures Section 1. General Description Section 2. Memory Map Section 3. Low Power Modes Section. Resets and Interrupts Section 5. Analog-to-Digital Converter (ADC) Section 6. Break Module (BRK) Section 7. Clock Generator Module (CGMC) Section 8. Configuration Register (CONFIG) Section 9. Computer Operating Properly (COP) Section 10. Central Processing Unit (CPU) Section 11. Flash Memory Section 12. External Interrupt (IRQ) Section 13. Keyboard Interrupt (KBI) Section 1. Low-Voltage Inhibit (LVI) Section 15. Monitor ROM (MON) Section 16. Input/Output Ports (I/O) MC68HC908GR8 Rev.0 Technical Data MOTOROLA List of Paragraphs 5

6 List of Paragraphs Section 17. RAM Section 18. Serial Communications Interface (SCI) Section 19. System Integration Module (SIM) Section 20. Serial Peripheral Interface (SPI) Section 21. Timebase Module (TBM) Section 22. Timer Interface Module (TIM) Section 23. Electrical Specifications Section 2. Mechanical Specifications Section 25. Ordering Information Glossary Revision History Technical Data MC68HC908GR8 Rev.0 6 List of Paragraphs MOTOROLA

7 Technical Data MC68HC908GR8 Table of Contents List of Paragraphs Table of Contents List of Tables List of Figures Section 1. General Description 1.1 Contents Introduction Features MCU Block Diagram Pin Assignments Pin Functions Section 2. Memory Map 2.1 Contents Introduction Unimplemented Memory Locations Reserved Memory Locations Input/Output (I/O) Section MC68HC908GR8 Rev.0 Technical Data MOTOROLA Table of Contents 7

8 Table of Contents Section 3. Low Power Modes 3.1 Contents Introduction Analog-to-Digital Converter (ADC) Break Module (BRK) Central Processor Unit (CPU) Clock Generator Module (CGM) Computer Operating Properly Module (COP) External Interrupt Module (IRQ) Keyboard Interrupt Module (KBI) Low-Voltage Inhibit Module (LVI) Serial Communications Interface Module (SCI) Serial Peripheral Interface Module (SPI) Timer Interface Module (TIM1 and TIM2) Timebase Module (TBM) Exiting Wait Mode Exiting Stop Mode Section. Resets and Interrupts.1 Contents Introduction Resets Interrupts Section 5. Analog-to-Digital Converter (ADC) 5.1 Contents Introduction Technical Data MC68HC908GR8 Rev.0 8 Table of Contents MOTOROLA

9 Table of Contents 5.3 Features Functional Description Interrupts Low-Power Modes I/O Signals I/O Registers Section 6. Break Module (BRK) 6.1 Contents Introduction Features Functional Description Low-Power Modes Break Module Registers Section 7. Clock Generator Module (CGMC) 7.1 Contents Introduction Features Functional Description I/O Signals CGMC Registers Interrupts Special Modes Acquisition/Lock Time Specifications MC68HC908GR8 Rev.0 Technical Data MOTOROLA Table of Contents 9

10 Table of Contents Section 8. Configuration Register (CONFIG) 8.1 Contents Introduction Functional Description Section 9. Computer Operating Properly (COP) 9.1 Contents Introduction Functional Description I/O Signals COP Control Register Interrupts Monitor Mode Low-Power Modes COP Module During Break Mode Section 10. Central Processing Unit (CPU) 10.1 Contents Introduction Features CPU registers Arithmetic/logic unit (ALU) Low-power modes CPU during break interrupts Instruction Set Summary Opcode Map Technical Data MC68HC908GR8 Rev.0 10 Table of Contents MOTOROLA

11 Table of Contents Section 11. Flash Memory 11.1 Contents Introduction Functional Description FLASH Control Register FLASH Page Erase Operation FLASH Mass Erase Operation FLASH Program/Read Operation FLASH Block Protection Wait Mode STOP Mode Section 12. External Interrupt (IRQ) 12.1 Contents Introduction Features Functional Description IRQ1 Pin IRQ Module During Break Interrupts IRQ Status and Control Register Section 13. Keyboard Interrupt (KBI) 13.1 Contents Introduction Features Functional Description Keyboard Initialization MC68HC908GR8 Rev.0 Technical Data MOTOROLA Table of Contents 11

12 Table of Contents 13.6 Low-Power Modes Keyboard Module During Break Interrupts I/O Registers Section 1. Low-Voltage Inhibit (LVI) 1.1 Contents Introduction Features Functional Description LVI Status Register LVI Interrupts Low-Power Modes Section 15. Monitor ROM (MON) 15.1 Contents Introduction Features Functional Description Security Section 16. Input/Output Ports (I/O) 16.1 Contents Introduction Port A Port B Port C Port D Technical Data MC68HC908GR8 Rev.0 12 Table of Contents MOTOROLA

13 Table of Contents 16.7 Port E Section 17. RAM 17.1 Contents Introduction Functional Description Section 18. Serial Communications Interface (SCI) 18.1 Contents Introduction Features Pin Name Conventions Functional Description Low-Power Modes SCI During Break Module Interrupts I/O Signals I/O Registers Section 19. System Integration Module (SIM) 19.1 Contents Introduction SIM Bus Clock Control and Generation Reset and System Initialization SIM Counter Exception Control Low-Power Modes SIM Registers MC68HC908GR8 Rev.0 Technical Data MOTOROLA Table of Contents 13

14 Table of Contents Section 20. Serial Peripheral Interface (SPI) 20.1 Contents Introduction Features Pin Name Conventions and I/O Register Addresses Functional Description Transmission Formats Queuing Transmission Data Error Conditions Interrupts Resetting the SPI Low-Power Modes SPI During Break Interrupts I/O Signals I/O Registers Section 21. Timebase Module (TBM) 21.1 Contents Introduction Features Functional Description Timebase Register Description Interrupts Low-Power Modes Section 22. Timer Interface Module (TIM) 22.1 Contents Technical Data MC68HC908GR8 Rev.0 1 Table of Contents MOTOROLA

15 Table of Contents 22.2 Introduction Features Pin Name Conventions Functional Description Interrupts Low-Power Modes TIM During Break Interrupts I/O Signals I/O Registers Section 23. Electrical Specifications 23.1 Contents Absolute Maximum Ratings Functional Operating Range Thermal Characteristics V DC Electrical Characteristics V DC Electrical Characteristics V Control Timing V Control Timing Output High-Voltage Characteristics Output Low-Voltage Characteristics Typical Supply Currents ADC Characteristics V SPI Characteristics V SPI Characteristics Timer Interface Module Characteristics MC68HC908GR8 Rev.0 Technical Data MOTOROLA Table of Contents 15

16 Table of Contents Clock Generation Module Characteristics Memory Characteristics Section 2. Mechanical Specifications 2.1 Contents Introduction Pin LQFP (Case #873A) Pin PDIP (Case #710) Pin SOIC (Case #751F) Section 25. Ordering Information 25.1 Contents Introduction MC Order Numbers Development Tools Glossary Revision History Contents Introduction Changes from Rev 3.0 published in February 2002 to Rev.0 published in June Changes from Rev 2.0 published in January 2002 to Rev 3.0 published in February Changes from Rev 1.0 published in April 2001 to Rev 2.0 published in December Technical Data MC68HC908GR8 Rev.0 16 Table of Contents MOTOROLA

17 Technical Data MC68HC908GR8 List of Tables Table Title Page 2-1 Vector Addresses Interrupt Sources Interrupt Source Flags Mux Channel Select ADC Clock Divide Ratio Numeric Example PRE 1 and PRE0 Programming VPR1 and VPR0 Programming Instruction Set Summary Opcode Map Examples of protect start address: LVIOUT Bit Indication Monitor Mode Signal Requirements and Options Mode Differences Monitor Baud Rate Selection READ (Read Memory) Command WRITE (Write Memory) Command IREAD (Indexed Read) Command IWRITE (Indexed Write) Command READSP (Read Stack Pointer) Command RUN (Run User Program) Command Port Control Register Bits Summary Port A Pin Functions Port B Pin Functions Port C Pin Functions Port D Pin Functions Port E Pin Functions Pin Name Conventions Start Bit Verification MC68HC908GR8 Rev.0 Technical Data MOTOROLA List of Tables 17

18 List of Tables 18-3 Data Bit Recovery Stop Bit Recovery Character Format Selection SCI Baud Rate Prescaling SCI Baud Rate Selection SCI Baud Rate Selection Examples Signal Name Conventions PIN Bit Set Timing Interrupt Sources SIM Registers Pin Name Conventions SPI Interrupts SPI Configuration SPI Master Baud Rate Selection Timebase Rate Selection for OSC1 = khz Pin Name Conventions Prescaler Selection Mode, Edge, and Level Selection Absolute Maximum Ratings Functional Operation Range Thermal Characteristics V DC Electrical Characteristics V DC Electrical Characteristics V Control Timing V Control Timing Timer Interface Module Characteristics CGM Component Specifications MC Order Numbers Development Tool Kits Development Tool Components Technical Data MC68HC908GR8 Rev.0 18 List of Tables MOTOROLA

19 Technical Data MC68HC908GR8 List of Figures Figure Title Page 1-1 MCU Block Diagram QFP Pin Assignments DIP And SOIC Pin Assignments Power Supply Bypassing Memory Map Control, Status, and Data Registers Internal Reset Timing Power-On Reset Recovery SIM Reset Status Register (SRSR) Interrupt Stacking Order Interrupt Recognition Example Interrupt Processing Interrupt Status Register 1 (INT1) Interrupt Status Register 2 (INT2) Interrupt Status Register 3 (INT3) ADC Block Diagram ADC Status and Control Register (ADSCR) ADC Data Register (ADR) ADC Clock Register (ADCLK) Break Module Block Diagram I/O Register Summary Break Status and Control Register (BRKSCR) Break Address Register High (BRKH) Break Address Register Low (BRKL) SIM Break Status Register (SBSR) SIM Break Flag Control Register (SBFCR) CGMC Block Diagram CGMC External Connections CGMC I/O Register Summary MC68HC908GR8 Rev.0 Technical Data MOTOROLA List of Figures 19

20 List of Figures 7- PLL Control Register (PCTL) PLL Bandwidth Control Register (PBWC) PLL Multiplier Select Register High (PMSH) PLL Multiplier Select Register Low (PMSL) PLL VCO Range Select Register (PMRS) PLL Reference Divider Select Register (PMDS) PLL Filter Configuration Register 2 (CONFIG2) Configuration Register 1 (CONFIG1) COP Block Diagram COP Control Register (COPCTL) CPU registers Accumulator (A) Index register (H:X) Stack pointer (SP) Program counter (PC) Condition code register (CCR) FLASH Control Register (FLCR) FLASH Programming Flowchart FLASH Block Protect Register (FLBPR) FLASH Block Protect Start Address IRQ Module Block Diagram IRQ I/O Register Summary IRQ Status and Control Register (INTSCR) Keyboard Module Block Diagram I/O Register Summary Keyboard Status and Control Register (INTKBSCR) Keyboard Interrupt Enable Register (INTKBIER) LVI Module Block Diagram LVI I/O Register Summary LVI Status Register (LVISR) Monitor Mode Circuit Low-Voltage Monitor Mode Entry Flowchart Monitor Data Format Break Transaction Read Transaction Write Transaction Stack Pointer at Monitor Mode Entry Technical Data MC68HC908GR8 Rev.0 20 List of Figures MOTOROLA

21 List of Figures 15-8 Monitor Mode Entry Timing I/O Port Register Summary Port A Data Register (PTA) Data Direction Register A (DDRA) Port A I/O Circuit Port A Input Pullup Enable Register (PTAPUE) Port B Data Register (PTB) Data Direction Register B (DDRB) Port B I/O Circuit Port C Data Register (PTC) Data Direction Register C (DDRC) Port C I/O Circuit Port C Input Pullup Enable Register (PTCPUE) Port D Data Register (PTD) Data Direction Register D (DDRD) Port D I/O Circuit Port D Input Pullup Enable Register (PTDPUE) Port E Data Register (PTE) Data Direction Register E (DDRE) Port E I/O Circuit SCI Module Block Diagram SCI I/O Register Summary SCI Data Formats SCI Transmitter SCI Receiver Block Diagram Receiver Data Sampling Slow Data Fast Data SCI Control Register 1 (SCC1) SCI Control Register 2 (SCC2) SCI Control Register 3 (SCC3) SCI Status Register 1 (SCS1) Flag Clearing Sequence SCI Status Register 2 (SCS2) SCI Data Register (SCDR) SCI Baud Rate Register (SCBR) SIM Block Diagram SIM I/O Register Summary MC68HC908GR8 Rev.0 Technical Data MOTOROLA List of Figures 21

22 List of Figures 19-3 CGM Clock Signals External Reset Timing Internal Reset Timing Sources of Internal Reset POR Recovery Interrupt Entry Timing Interrupt Recovery Timing Interrupt Processing Interrupt Recognition Example Interrupt Status Register 1 (INT1) Interrupt Status Register 2 (INT2) Interrupt Status Register 3 (INT3) Wait Mode Entry Timing Wait Recovery from Interrupt or Break Wait Recovery from Internal Reset Stop Mode Entry Timing Stop Mode Recovery from Interrupt or Break SIM Break Status Register (SBSR) SIM Reset Status Register (SRSR) SIM Break Flag Control Register (SBFCR) SPI I/O Register Summary SPI Module Block Diagram Full-Duplex Master-Slave Connections Transmission Format (CPHA = 0) CPHA/SS Timing Transmission Format (CPHA = 1) Transmission Start Delay (Master) SPRF/SPTE CPU Interrupt Timing Missed Read of Overflow Condition Clearing SPRF When OVRF Interrupt Is Not Enabled SPI Interrupt Request Generation CPHA/SS Timing SPI Control Register (SPCR) SPI Status and Control Register (SPSCR) SPI Data Register (SPDR) Timebase Block Diagram Timebase Control Register (TBCR) TIM Block Diagram Technical Data MC68HC908GR8 Rev.0 22 List of Figures MOTOROLA

23 List of Figures 22-2 TIM I/O Register Summary PWM Period and Pulse Width TIM Status and Control Register (TSC) TIM Counter Registers High (TCNTH) TIM Counter Registers Low (TCNTL) TIM Counter Modulo Register High (TMODH) TIM Counter Modulo Register Low (TMODL) TIM Counter Register High (TCNTH) TIM Counter Register Low (TCNTL) TIM Channel 0 Status and Control Register (TSC0) TIM Channel 1 Status and Control Register (TSC1) CHxMAX Latency TIM Channel 0 Register High (TCH0H) TIM Channel 0 Register Low (TCH0L) TIM Channel 1 Register High (TCH1H) TIM Channel 1 Register Low (TCH1L) Typical High-Side Driver Characteristics Port PTA3 PTA0 (V DD =.5 Vdc) Typical High-Side Driver Characteristics Port PTA3 PTA0 (V DD = 2.7 Vdc) Typical High-Side Driver Characteristics Port PTC1 PTC0 (V DD =.5 Vdc) Typical High-Side Driver Characteristics Port PTC1 PTC0 (V DD = 2.7 Vdc) Typical High-Side Driver Characteristics Ports PTB5 PTB0, PTD6 PTD0, and PTE1 PTE0 (V DD = 5.5 Vdc) Typical High-Side Driver Characteristics Ports PTB5 PTB0, PTD6 PTD0, and PTE1 PTE0 (V DD = 2.7 Vdc) Typical Low-Side Driver Characteristics Port PTA3 PTA0 (V DD = 5.5 Vdc) Typical Low-Side Driver Characteristics Port PTA3 PTA0 (V DD = 2.7 Vdc) Typical Low-Side Driver Characteristics Port PTC1 PTC0 (V DD =.5 Vdc) Typical Low-Side Driver Characteristics Port PTC1 PTC0 (V DD = 2.7 Vdc) Typical Low-Side Driver Characteristics Ports PTB5 PTB0, PTD6 PTD0, and PTE1 PTE0 (V DD = 5.5 Vdc) MC68HC908GR8 Rev.0 Technical Data MOTOROLA List of Figures 23

24 List of Figures Typical Low-Side Driver Characteristics Ports PTB5 PTB0, PTD6 PTD0, and PTE1 PTE0 (V DD = 2.7 Vdc) Typical Operating IDD, with All Modules Turned On ( 0 C to 125 C) Typical Wait Mode IDD, with all Modules Disabled ( 0 C to 125 C) Typical Stop Mode IDD, with all Modules Disabled ( 0 C to 125 C) SPI Master Timing SPI Slave Timing Technical Data MC68HC908GR8 Rev.0 2 List of Figures MOTOROLA

25 Technical Data MC68HC908GR8 Section 1. General Description 1.1 Contents 1.2 Introduction Features MCU Block Diagram Pin Assignments Pin Functions Introduction The MC68HC908GR8 is a member of the low-cost, high-performance M68HC08 Family of 8-bit microcontroller units (MCUs). All MCUs in the family use the enhanced M68HC08 central processor unit (CPU08) and are available with a variety of modules, memory sizes and types, and package types. This document also describes the MC68HC908GR. The MC68HC908GR is a device identical to the MC68HC908GR8 except that it has less Flash memory. Only when there are differences from the MC68HC908GR8 is the MC68HC908GR specifically mentioned in the text. MC68HC908GR8 Rev.0 Technical Data MOTOROLA General Description 25

26 General Description 1.3 Features For convenience, features have been organized to reflect: Standard features of the MC68HC908GR8 Features of the CPU Standard Features of the MC68HC908GR8 High-performance M68HC08 architecture optimized for C- compilers Fully upward-compatible object code with M6805, M16805, and M68HC05 Families 8-MHz internal bus frequency FLASH program memory security (1) On-chip programming firmware for use with host personal computer which does not require high voltage for entry In-system programming System protection features: Optional computer operating properly (COP) reset Low-voltage detection with optional reset and selectable trip points for 3.0 V and 5.0 V operation Illegal opcode detection with reset Illegal address detection with reset Low-power design; fully static with stop and wait modes Standard low-power modes of operation: Wait mode Stop mode Master reset pin and power-on reset (POR) 1. No security feature is absolutely secure. However, Motorola s strategy is to make reading or copying the FLASH difficult for unauthorized users. Technical Data MC68HC908GR8 Rev.0 26 General Description MOTOROLA

27 General Description Features 7680 bytes of on-chip FLASH memory on the MC68HC908GR8 and 096 bytes of on-chip FLASH memory on the MC68HC908GR with in-circuit programming capabilities of FLASH program memory 38 bytes of on-chip random-access memory (RAM) Serial peripheral interface module (SPI) Serial communications interface module (SCI) One 16-bit, 2-channel timer (TIM1) and one 16-bit, 1-channel timer (TIM2) interface modules with selectable input capture, output compare, and PWM capability on each channel 6-channel, 8-bit successive approximation analog-to-digital converter (ADC) BREAK module (BRK) to allow single breakpoint setting during incircuit debugging Internal pullups on IRQ and RST to reduce customer system cost Clock generator module with on-chip 32-kHz crystal compatible PLL (phase-lock loop) Up to 21 general-purpose input/output (I/O) pins, including: 19 shared-function I/O pins Up to two dedicated I/O pins, depending on package choice Selectable pullups on inputs only on ports A, C, and D. Selection is on an individual port bit basis. During output mode, pullups are disengaged. High current 10-mA sink/10-ma source capability on all port pins Higher current 15-mA sink/source capability on PTC0 PTC1 Timebase module with clock prescaler circuitry for eight user selectable periodic real-time interrupts with optional active clock source during stop mode for periodic wakeup from stop using an external 32-kHz crystal Oscillator stop mode enable bit (OSCSTOPENB) in the CONFIG register to allow user selection of having the oscillator enabled or disabled during stop mode MC68HC908GR8 Rev.0 Technical Data MOTOROLA General Description 27

28 General Description -bit keyboard wakeup port 32-pin quad flat pack (QFP) or 28-pin plastic dual-in-line package (DIP) or 28-pin small outline integrated circuit (SOIC) Specific features of the MC68HC908GR8 in 28-pin DIP and 28-pin SOIC are: Port B is only bits: PTB0 PTB3; -channel ADC module No Port C bits Features of the CPU08 Features of the CPU08 include: Enhanced HC05 programming model Extensive loop control functions 16 addressing modes (eight more than the HC05) 16-bit index register and stack pointer Memory-to-memory data transfers Fast 8 8 multiply instruction Fast 16/8 divide instruction Binary-coded decimal (BCD) instructions Optimization for controller applications Efficient C language support 1. MCU Block Diagram Figure 1-1 shows the structure of the MC68HC908GR8. Technical Data MC68HC908GR8 Rev.0 28 General Description MOTOROLA

29 MOTOROLA General Description 29 MC68HC908GR8 Rev.0 Technical Data Figure 1-1. MCU Block Diagram CPU REGISTERS M68HC08 CPU ARITHMETIC/LOGIC UNIT (ALU) CONTROL AND STATUS REGISTERS 6 BYTES MC68HC908GR8 USER FLASH 7680 BYTES MC68HC908GR USER FLASH 096BYTES USER RAM 38 BYTES MONITOR ROM 310 BYTES FLASH PROGRAMMING (BURN-IN) ROM 5 BYTES USER FLASH VECTOR SPACE 36 BYTES OSC1 OSC2 CGMXFC * RST * IRQ V DDAD / V REFH V SSAD / V REFL V DD V SS V DDA V SSA CLOCK GENERATOR MODULE 32-kHz OSCILLATOR PHASE-LOCKED LOOP 2 INTR SYSTEM INTEGRATION MODULE SINGLE EXTERNAL IRQ MODULE 8-BIT ANALOG-TO-DIGITAL CONVERTER MODULE POWER Ports are software configurable with pullup device if input port. Higher current drive port pins * Pin contains integrated pullup device INTERNAL BUS PROGR. TIMEBASE MODULE SINGLE BRKPT BREAK MODULE DUAL V. LOW-VOLTAGE INHIBIT MODULE -BIT KEYBOARD INTERRUPT MODULE 2-CHANNEL TIMER INTERFACE MODULE 1 1-CHANNEL TIMER INTERFACE MODULE 2 SERIAL COMMUNICATIONS INTERFACE MODULE COMPUTER OPERATING PROPERLY MODULE SERIAL PERIPHERAL INTERFACE MODULE MONITOR MODULE DATA BUS SWITCH MODULE MEMORY MAP MODULE MASK OPTION REGISTER1 MODULE MASK OPTION REGISTER2 MODULE DDRE DDRD DDRC DDRB DDRA PORTA PORTB PORTC PORTD PORTE SECURITY MODULE PTA3/KBD3 PTA0/KBD0 PTB5/AD5 PTB0/AD0 PTC1 PTC0 PTD6/T2CH0 PTD5/T1CH1 PTD/T1CH0 PTD3/SPSCK PTD2/MOSI PTD1/MISO PTD0/SS PTE1/RxD PTE0/TxD POWER-ON RESET MODULE MONITOR MODE ENTRY MODULE General Description MCU Block Diagram

30 General Description 1.5 Pin Assignments OSC1 OSC2 CGMXFC V SSA V DDA PTC1 PTC0 PTA3/KBD3 RST PTA2/KBD2 PTE0/TxD 2 23 PTA1/KBD1 PTE1/RxD 3 22 PTA0/KBD0 IRQ 21 V SSAD /V REFL PTD0/SS 5 20 V DDAD /V REFH PTD1/MISO 6 19 PTB5/AD5 PTD2/MOSI 7 18 PTB/AD PTD3/SPSCK PTB3/AD3 V SS V DD PTD/T1CH0 PTD5/T1CH1 PTD6/T2CH0 PTB0/AD PTB1/AD1 PTB2/AD2 NOTE: Ports PTB, PTB5, PTC0, and PTC1 are available only with the QFP. Figure 1-2. QFP Pin Assignments Technical Data MC68HC908GR8 Rev.0 30 General Description MOTOROLA

31 General Description Pin Functions CGMXFC OSC2 OSC1 RST PTE0/TxD PTE1/RxD IRQ PTD0/SS PTD1/MISO PTD2/MOSI PTD3/SPSCK V SS V DD PTD/T1CH V SSA V DDA PTA3/KBD3 PTA2/KBD2 PTA1/KBD1 PTA0/KBD0 V SSAD /V REFL V DDAD /V REFH PTB3/AD3 PTB2/AD2 PTB1/AD1 PTB0/AD0 PTD6/T2CH0 PTD5/T1CH1 NOTE: Ports PTB, PTB5, PTC0, and PTC1 are available only with the QFP. Figure 1-3. DIP And SOIC Pin Assignments 1.6 Pin Functions Descriptions of the pin functions are provided here Power Supply Pins (V DD and V SS ) V DD and V SS are the power supply and ground pins. The MCU operates from a single power supply. Fast signal transitions on MCU pins place high, short-duration current demands on the power supply. To prevent noise problems, take special care to provide power supply bypassing at the MCU as Figure 1- shows. Place the C1 bypass capacitor as close to the MCU as possible. Use a high-frequency-response ceramic capacitor for C1. C2 is an optional bulk current bypass capacitor for use in applications that require the port pins to source high current levels. MC68HC908GR8 Rev.0 Technical Data MOTOROLA General Description 31

32 General Description MCU V DD V SS C1 0.1 µf + C2 V DD NOTE: Component values shown represent typical applications. Figure 1-. Power Supply Bypassing Oscillator Pins (OSC1 and OSC2) The OSC1 and OSC2 pins are the connections for the on-chip oscillator circuit. See Clock Generator Module (CGMC) External Reset Pin (RST) A logic 0 on the RST pin forces the MCU to a known startup state. RST is bidirectional, allowing a reset of the entire system. It is driven low when any internal reset source is asserted. This pin contains an internal pullup resistor that is always activated, even when the reset pin is pulled low. See Resets and Interrupts External Interrupt Pin (IRQ) IRQ is an asynchronous external interrupt pin. This pin contains an internal pullup resistor that is always activated, even when the reset pin is pulled low. See External Interrupt (IRQ) CGM Power Supply Pins (V DDA and V SSA ) V DDA and V SSA are the power supply pins for the analog portion of the clock generator module (CGM). Decoupling of these pins should be as per the digital supply. See Clock Generator Module (CGMC). Technical Data MC68HC908GR8 Rev.0 32 General Description MOTOROLA

33 General Description Pin Functions External Filter Capacitor Pin (CGMXFC) CGMXFC is an external filter capacitor connection for the CGM. See Clock Generator Module (CGMC) Analog Power Supply/Reference Pins (V DDAD /V REFH and V SSAD /V REFL ) V DDAD and V SSAD are the power supply pins for the analog-to-digital converter. Decoupling of these pins should be as per the digital supply. NOTE: V REFH is the high reference supply for the ADC. The V REFH signal is internally connected with V DDAD and have the same potential as V DDAD. V DDAD should be tied to the same potential as V DD via separate traces. V REFL is the low reference supply for the ADC. The V REFL pin is internally connected with V SSAD and has the same potential as V SSAD. V SSAD should be tied to the same potential as V SS via separate traces. See Analog-to-Digital Converter (ADC) Port A Input/Output (I/O) Pins (PTA3/KBD3 PTA0/KBD0) PTA3 PTA0 are special-function, bidirectional I/O port pins. Any or all of the port A pins can be programmed to serve as keyboard interrupt pins. See Input/Output Ports (I/O) and External Interrupt (IRQ). These port pins also have selectable pullups when configured for input mode. The pullups are disengaged when configured for output mode. The pullups are selectable on an individual port bit basis. When the port pins are configured for special-function mode (KBI), pullups will be automatically engaged. As long as the port pins are in special-function mode, the pullups will always be on Port B I/O Pins (PTB5/AD5 PTB0/AD0) PTB5 PTB0 are special-function, bidirectional I/O port pins that can also be used for analog-to-digital converter (ADC) inputs. See Input/Output Ports (I/O) and Analog-to-Digital Converter (ADC). There are no pullups associated with this port. MC68HC908GR8 Rev.0 Technical Data MOTOROLA General Description 33

34 General Description Port C I/O Pins (PTC1 PTC0) PTC1 PTC0 are general-purpose, bidirectional I/O port pins. See Input/Output Ports (I/O). PTC0 and PTC1 are only available on 32-pin QFP packages. These port pins also have selectable pullups when configured for input mode. The pullups are disengaged when configured for output mode. The pullups are selectable on an individual port bit basis Port D I/O Pins (PTD6/T2CH0 PTD0/SS) PTD6 PTD0 are special-function, bidirectional I/O port pins. PTD3 PTD0 can be programmed to be serial peripheral interface (SPI) pins, while PTD6 PTD can be individually programmed to be timer interface module (TIM1 and TIM2) pins. See Timer Interface Module (TIM), Serial Peripheral Interface (SPI), and Input/Output Ports (I/O). These port pins also have selectable pullups when configured for input mode. The pullups are disengaged when configured for output mode. The pullups are selectable on an individual port bit basis. When the port pins are configured for special-function mode (SPI, TIM1, TIM2), pullups can be selectable on an individual port pin basis Port E I/O Pins (PTE1/RxD PTE0/TxD) PTE1 PTE0 are special-function, bidirectional I/O port pins. These pins can also be programmed to be serial communications interface (SCI) pins. See Serial Communications Interface (SCI) and Input/Output Ports (I/O). NOTE: Any unused inputs and I/O ports should be tied to an appropriate logic level (either V DD or V SS ). Although the I/O ports of the MC68HC908GR8 do not require termination, termination is recommended to reduce the possibility of electro-static discharge damage. Technical Data MC68HC908GR8 Rev.0 3 General Description MOTOROLA

35 Technical Data MC68HC908GR8 Section 2. Memory Map 2.1 Contents 2.2 Introduction Unimplemented Memory Locations Reserved Memory Locations Input/Output (I/O) Section Introduction The CPU08 can address 6K bytes of memory space. The memory map, shown in Figure 2-1, includes: 8K bytes of FLASH memory, 7680 bytes of user space on the MC68HC908GR8 or K bytes of FLASH memory, 096 bytes of user space on the MC68HC908GR 38 bytes of random-access memory (RAM) 36 bytes of user-defined vectors 310 bytes of monitor routines in read-only memory (ROM) 5 bytes of integrated FLASH burn-in routines in ROM 2.3 Unimplemented Memory Locations Accessing an unimplemented location can cause an illegal address reset if illegal address resets are enabled. In the memory map (Figure 2-1) and in register figures in this document, unimplemented locations are shaded. MC68HC908GR8 Rev.0 Technical Data MOTOROLA Memory Map 35

36 Memory Map 2. Reserved Memory Locations Accessing a reserved location can have unpredictable effects on MCU operation. In the Figure 2-1 and in register figures in this document, reserved locations are marked with the word Reserved or with the letter R. 2.5 Input/Output (I/O) Section Most of the control, status, and data registers are in the zero page area of $0000 $003F. Additional I/O registers have these addresses: $FE00; SIM break status register, SBSR $FE01; SIM reset status register, SRSR $FE03; SIM break flag control register, SBFCR $FE09; interrupt status register 1, INT1 $FE0A; interrupt status register 2, INT2 $FE0B; interrupt status register 3, INT3 $FE07; reserved FLASH test control register, FLTCR $FE08; FLASH control register, FLCR $FE09; break address register high, BRKH $FE0A; break address register low, BRKL $FE0B; break status and control register, BRKSCR $FE0C; LVI status register, LVISR $FF7E; FLASH block protect register, FLBPR Data registers are shown in Figure 2-2, and Table 2-1 is a list of vector locations. Technical Data MC68HC908GR8 Rev.0 36 Memory Map MOTOROLA

37 Memory Map Input/Output (I/O) Section $0000 $003F $000 $01BF $01C0 $1BFF $1C00 $1E1F $1E20 $DFFF I/O Registers 6 Bytes RAM 38 Bytes Unimplemented 6720 Bytes Reserved for Integrated FLASH Burn-in Routines 5 Bytes Unimplemented 9,632 Bytes $E000 $EDFF $EE00 $FDFF MC68HC908GR8 FLASH Memory 7680 Bytes MC68HC908GR Unimplemented 358 Bytes MC68HC908GR FLASH Memory 096 Bytes $FE00 $FE01 $FE02 $FE03 $FE09 $FE0A $FE0B $FE07 SIM Break Status Register (SBSR) SIM Reset Status Register (SRSR) Reserved SIM Break Flag Control Register (SBFCR) Interrupt Status Register 1 (INT1) Interrupt Status Register 2 (INT2) Interrupt Status Register 3 (INT3) Reserved for FLASH Test Control Register (FLTCR) Figure 2-1. Memory Map MC68HC908GR8 Rev.0 Technical Data MOTOROLA Memory Map 37

38 Memory Map Note: $FFF6 $FFFD contains 8 security bytes $FE08 $FE09 $FE0A $FE0B $FE0C $FE0D $FE0F $FE10 $FE1F $FE20 $FF55 $FF56 $FF7D $FF7E $FF7F $FFDB $FFDC $FFFE FLASH Control Register (FLCR) Break Address Register High (BRKH) Break Address Register Low (BRKL) Break Status and Control Register (BRKSCR) LVI Status Register (LVISR) Reserved 3 Bytes Unimplemented 16 Bytes Reserved for Compatibility with Monitor Code for A-Family Parts Monitor ROM 310 Bytes Unimplemented 0 Bytes FLASH Block Protect Register (FLBPR) Unimplemented 93 Bytes FLASH Vectors (36 Bytes inluding $FFFF) $FFFF Low byte of reset vector when read COP Control Register (COPCTL) Figure 2-1. Memory Map (Continued) Technical Data MC68HC908GR8 Rev.0 38 Memory Map MOTOROLA

39 Memory Map Input/Output (I/O) Section Addr. Register Name Bit Bit 0 $0000 $0001 $0002 $0003 $000 $0005 $0006 $0007 $0008 Port A Data Register (PTA) Port B Data Register (PTB) Port C Data Register (PTC) Port D Data Register (PTD) Data Direction Register A (DDRA) Data Direction Register B (DDRB) Data Direction Register C (DDRC) Data Direction Register D (DDRD) Port E Data Register (PTE) Read: Write: Reset: Read: 0 0 Write: Reset: Unaffected by reset PTA3 PTA2 PTA1 PTA0 PTB5 PTB PTB3 PTB2 PTB1 PTB0 Unaffected by reset Read: Write: Reset: Read: 0 Write: Reset: Unaffected by reset PTC1 PTC0 PTD6 PTD5 PTD PTD3 PTD2 PTD1 PTD0 Read: Write: Unaffected by reset DDRA3 DDRA2 DDRA1 DDRA0 Reset: Read: 0 0 Write: DDRB5 DDRB DDRB3 DDRB2 DDRB1 DDRB0 Reset: Read: Write: DDRC1 Reset: Read: 0 Write: DDRC0 DDRD6 DDRD5 DDRD DDRD3 DDRD2 DDRD1 DDRD0 Reset: Read: Write: Reset: Read: Unaffected by reset $0009 Unimplemented Write: Reset: = Unimplemented R = Reserved U = Unaffected Figure 2-2. Control, Status, and Data Registers (Sheet 1 of 8) PTE1 PTE0 MC68HC908GR8 Rev.0 Technical Data MOTOROLA Memory Map 39