Lecture 14. Ali Karimpour Associate Professor Ferdowsi University of Mashhad
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1 Lecture 14 AUTOMATIC CONTROL SYSTEMS Ali Karimpour Associate Professor Ferdowsi University of Mashhad
2 Lecture 4 The AVR Microcontroller
3 Introduction to AVR CISC (Complex Instruction Set Computer) Put as many instruction as you can into the CPU RISC (Reduced Instruction Set Computer) Reduce the number of instructions, and use your facilities in a more proper way. RISC processors have a fixed instruction size. In AVR the instructions are 2 or 4 bytes. Reduce the number of instructions so higher speed. More than 95% of instructions are executed in 1 machine cycle. Use of high level language for programming.
4 AVR structure ALU SREG: I T H S V N Z C CPU PC Instruction decoder Instruction Register R0 R1 R2 R15 R16 R17 R30 R31 registers 4
5 AVR s CPU AVR s CPU ALU 32 General Purpose registers (R0 to R31) PC register Instruction decoder ALU SREG: I T H S V N Z C PC CPU Instruction decoder Instruction Register R0 R1 R2 R15 R16 R17 R30 R31 registers 5
6 Some simple instructions There are some instructions for loading values, doing arithmetic and logic operations; such as: LDI (Load Immediate), ADD, SUB, INC, DEC, AND, etc. LDI Rd, k % In high level language Rd = k ADD Rd,Rs % Rd = Rd + Rs SUB Rd,Rs % Rd = Rd Rs IVC Rd % Rd=Rd+1 DEC Rd %Rd=Rd-1 Write a program that calculates LDI R16, 19 ;R16 = 19 LDI R20, 95 ;R20 = 95 ADD R16, R20 ;R16 = R16 + R20 ALU SREG: I T H S V N Z C CPU PC Instruction decoder Instruction Register R0 R1 R2 R15 R16 R17 R30 R31 registers
7 R0 through R15 Only registers in the range R16 to R31 can be loaded immediate. We cannot load a constant into the registers R0 to R15 directly. It would have to be loaded into a valid register first then copied. To load the value of 10 into register zero (R0): LDI R16,10 ;R16=10 MOV R0,R16 Copy contents of R16 to R0 ALU SREG: I T H S V N Z C PC CPU Instruction decoder Instruction Register R0 R1 R2 R15 R16 R17 R30 R31 registers
8 Status Register (SREG) The Status Register contains information about the result of the most recently executed arithmetic instruction. This information can be used for altering program flow in order to perform conditional operations. This will in many cases remove the need for using the dedicated compare instructions, resulting in faster and more compact code. SREG: Interrupt I Temporary ALU T Half carry SREG: I T H S V N Z C CPU PC Instruction decoder Instruction Register H S V N Z C Sign N+V overflow Negative R0 R1 R2 R15 R16 R17 R30 R31 registers Zero Carry
9 Status Register (SREG) SREG: I T H S V N Z C Bit 7(I): Global Interrupt Enable Bit 6(T): Bit Copy Storage Bit 5(H): Half Carry Flag Bit 4(S): Sign Bit, S = N V Bit 3(V): Two s Complement Overflow Flag Bit 2(N): Negative Flag Bit 1(Z): Zero Flag Bit 0(C): Carry Flag Interrupt Temporary Half carry ALU Sign N+V SREG: I T H S V N Z C CPU PC Instruction decoder Instruction Register overflow Negative R0 R1 R2 R15 R16 R17 R30 R31 registers Zero Carry
10 Addresses Register (SREG) ALU SREG: I T H S V N Z C CPU PC Instruction decoder Instruction Register R0 R1 R2 R15 R16 R17 R30 R31 registers
11 AVR different groups Classic AVR e.g. AT90S2313, AT90S4433 Mega e.g. ATmega8, ATmega32, ATmega128 Tiny e.g. ATtiny13, ATtiny25 Special Purpose AVR e.g. AT90PWM216,AT90USB1287
12 ATMEGA32 Features High-performance, Low-power Atmel AVR 8- bit Microcontroller 131 Powerful Instructions Most Single-clock Cycle Execution 32 8 General Purpose Working Registers 32Kbytes of In-System Self-programmable Flash program memory (W/E: 10,000 times) 1024Bytes EEPROM (W/E: 100,000 times) Data retention: 20 years at 85 C/100 years at 25 C Programming of Flash, EEPROM, Fuses, and Lock Bits through the JTAG Interface 12
13 ATMEGA32 Features Operating Voltages 2.7V - 5.5V for ATmega32L 4.5V - 5.5V for ATmega32 Speed Grades 0-8MHz for ATmega32L 0-16MHz for ATmega32 Power Consumption at 1MHz, 3V, 25 C Active: 1.1mA Idle Mode: 0.35mA Power-down Mode: < 1μA 13
14 ATMEGA32 Pin Configurations 14
15 ATMEGA32 Peripheral Features Two 8-bit Timer/Counters and one 16-bit Four PWM Channels 8-channel, 10-bit ADC Programmable Serial USART Programmable Watchdog Timer with Separate Onchip Oscillator On-chip Analog Comparator Internal Calibrated RC Oscillator External and Internal Interrupt Sources Six Sleep Modes: Idle, ADC Noise Reduction, Powersave, Power-down, Standby and Extended Standby 15
16 ATMEGA32 Pin Descriptions VCC GND Digital supply voltage. Ground. Port A (PA7..PA0) Port A is an 8-bit bi-directional I/O port. Port B (PB7..PB0) Port B is an 8-bit bi-directional I/O port. Port C (PC7..PC0) Port C is an 8-bit bi-directional I/O port. Port D (PD7..PD0) Port D is an 8-bit bi-directional I/O port. 16
17 ATMEGA32 Pin Descriptions RESET Reset Input. XTAL1 Input to the inverting Oscillator amplifier and input to the internal clock operating circuit. XTAL2 Output from the inverting Oscillator amplifier. AVCC AVCC is the supply voltage pin for Port A and the A/D Converter. AREF AREF is the analog reference pin for the A/D Converter. 17
18 ATMEGA32 Pin Descriptions Port A Pins Alternate Functions Chapter 4 ADC0-7 Port A serves as the analog inputs to the A/D Converter. 18
19 ATMEGA32 Pin Descriptions Chapter 4 Port B Pins Alternate Functions XCK/T0 T0 (Timer/Counter0 External Counter Input) XCK (USART External Clock Input/Output) T1 T1 (Timer/Counter1 External Counter Input) INT2/AINO AIN0 (Analog Comparator Positive Input) INT2 (External Interrupt 2 Input) 19
20 ATMEGA32 Pin Descriptions Port D Pins Alternate Functions Chapter 4 PD2 INT0 (External Interrupt 0 Input) PD3 INT1 (External Interrupt 1 Input) 20
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