Microcontrollers and the Freescale/Motorola HC11
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1 Microcontrollers and the Freescale/Motorola HC11
2 What is a microcontroller? A computer on a chip used to control electronic devices A microprocessor Usually not cutting edge (4-bit to 32-bit) Dependable (all major bugs well known) Predictable (critical for real-time processing) On-chip peripherals and memory Parallel and serial digital I/O Analog I/O Counters and timers Internal ROM, RAM and/or EPROM CMPE12 Summer
3 What are microcontrollers used in? Microcontrollers are used in Watches Microwaves Stereo Receivers ATMs PDAs, MP3 players Automobiles (between 9 and 50) Some products that you might know: NASA s Sojourner Rover 8-bit Intel 80C85 Palm Vx handheld 32-bit Motorola Dragonball EZ Sonicare toothbrush 8-bit Zilog Z8 The Vendo V-MAX 720 Soda Machine Motorola HC11 Miele dishwasher 8-bit Motorola 68HC05 Hunter Programmable Thermostat (4-bit cpu) CMPE12 Summer
4 Microprocessor unit sales Microprocessor unit sales are 100 times higher than microcontroller sales Microprocessor: 220 million Microcontroller: 20 billion Microcontrollers are much, much cheaper 55% of CPUs sold are 8- bit microcontrollers and microprocessors CMPE12 Summer
5 Languages for microcontrollers Language Assembly ~ 21% ~ 10% C ~ 69% ~ 80% C++ ~ 5% ~ 6% Java ~ 1 % ~ 2% Other ~ 3 % ~ 2% Source: TRON Association Survey 1998/99 & 1999/2000 CMPE12 Summer
6 Motorola / Freescale MC68HC11A8 M6801 CPU core Memory: 8KB ROM 512B EEPROM 256B RAM Counter/Timer system 8-channel, 8-bit A/D converter Analog to digital converter (external D/A in our kit) Parallel I/O port Two serial I/O ports: Asynchronous, SCI Synchronous, SPI Expansion bus for external memory CMPE12 Summer
7 What are RAM and ROM? RAM: Random-access memory Write to any location with the same effort (Same amount of time) ROM: (Random-access) read-only memory PROM: Programmable ROM EPROM: Erasable PROM Erasable with UV light Phased out since about 1998 EEPROM: Electrically-erasable PROM Flash EEPROM: Faster EEPROM CMPE12 Summer
8 High-level HC11 architecture Interrupt logic MEMORY Timer and counter M8601 CPU core Serial I/O A/D converter Port A Port B Port C Port D Port E CMPE12 Summer
9 Our HC11 microkit LCD display brightness control LCD Serial cable to PC AC/DC Power adapter LEDs HC11 µc Switches CMPE12 Summer
10 Our HC11 microkit board Serial (RS232C) connector LCD display brightness control HC11 µc External RAM HW Reset EEPROM LEDs Interrupt Switches CMPE12 Summer
11 HC11 programmer-accessible hardware Buttons Reset Interrupt (IRQ) Switches 8 switches, MSb on far left and LSb on far right Accessed by reading from SWITCHES LEDs 8 LEDs, MSb on far left and LSb on far right Accessed by writing to LEDS Active low (writing a 0 turns a light on) LCD Two lines, 16 characters per line We provide some routines output to LCD CMPE12 Summer
12 The HC11 instruction set architecture Mixed 8-bit/16-bit architecture CISC, with more than 100 opcodes One instruction can use several addressing modes, depending on how you use it Accumulator architecture CMPE12 Summer
13 An aside: accumulator architecture One operand comes from memory The other comes from the accumulator CMPE12 Summer
14 The HC11 accumulators and registers Two 8-bit accumulators, or you can use them together as one 16-bit accumulator Two 8-bit accumulators, A or B One 16-bit accumulator [A:B], called D Two index registers Two 16-bit index registers, X and Y, used for addressing memory or for counting Special registers 16-bit dedicated stack pointer, SP 16-bit program counter, PC 8-bit condition codes register, CCR CMPE12 Summer
15 The HC11 registers CMPE12 Summer
16 Accumulators: A, B, and D General-purpose 8-bit accumulators Source/destination of most operations Almost always interchangeable E.g., ABA, add B to A A (A + B) B is unchanged Note that there is no AAB instruction SBA, subtract B from A A (A B) Note that there is no SAB instruction 7 A 0 7 B 0 15 D 0 CMPE12 Summer
17 Accumulators: A, B, and D Some instructions use [A:B] as a single 16-bit register D E.g. ADDD #2 LDD #1 MUL 7 A 0 7 B 0 15 D 0 CMPE12 Summer
18 Index registers X and Y 15 X 0 15 Y 0 16-bit index registers X and Y: Used for indexed addressing mode Swap with register D to perform complex address operations Address space: 64KB LC-3: 64K words, which is 128 KB CMPE12 Summer
19 HC11 User Stack The HC11 has a stack set up at start-up Memory is byte-addressable PSHA PSHY PULA PULY // push accumulator A onto stack // SP = SP 1 since a byte size // push index register Y onto stack // SP = SP 2 since a word size // Pop off a byte from the stack into A // SP = SP + 1 // Pop off a word from the stack into Y // SP = SP + 2 CMPE12 Summer
20 An aside: the RPN calculator RPN is Reverse Polish Notation HP calculators E.g., A = CD+E Push C Push D Mult Push E Add Pop A DE CD+E CCD A TOP CMPE12 Summer
21 Stack pointer: SP 16-bit stack pointer, SP Automatically incremented or decremented on pushes and pops Can be used for data and return addresses Return address for subroutines is automatically pushed with jsr and popped with rts 15 SP 0 CMPE12 Summer
22 Program counter: PC 16-bit program counter, PC 15 PC 0 CMPE12 Summer
23 Condition code register: CCR Five status indicators H, half carry (used only for BCD operations) N, negative Z, zero S X H I N Z V C V, overflow (two s complement) C, carry/borrow many instructions set them all, but not all instructions Two interrupt masking bits I, disable all maskable interrupts (1 = disable) X, disable external interrupts (1 = disable) A STOP-disable bit disables the STOP instruction CMPE12 Summer
24 Programming on the HC11 microkit Design environment: Edit the source file Assemble on UNIX machine > hc11build file.asm Will produce an object (executable) file called file.s19 Download program to the PC with terminal program TeraTerm Upload to the microkit using serial cable To use kits at home Get one at BELS Have a connection to ITS machines Get TeraTerm, which is free Or any program which is capable of serial communication CMPE12 Summer
25 Programming on the HC11 microkit As part of your program, always have #include <v2_18g3.asm> What the include file does Sets up memory, including the stack pointer Jumps to the main label Includes a basic library of I/O routines CMPE12 Summer
26 Structure of a source program /* header comments */ #include <v2_18g3.asm>.sect.data // your variables here.sect.text // your code here main: // must have a main: function CMPE12 Summer
27 Example program echo.asm #include <v2_18g3.asm>.sect.data signon:.asciz "CMPE12C Welcome!" prompt:.asciz ">".sect.text main: ldx #signon jsr OUTSTRING // write a null-terminated // string to serial port echo_loop: ldx #prompt // address of prompt jsr OUTSTRING // write out to serial port jsr GETCHAR // getchar returns in ACCA jsr OUTCHAR // write ACCA to screen jsr OUTCRLF // write '\n' to serial port jmp echo_loop CMPE12 Summer
28 Example program factorial The factorial function x! = x (x-1) (x-2) Two ways to do it Recursively Non-recursively Draw a flow chart Write an algorithm CMPE12 Summer
29 Example program factorial.asm (1/2) 1 #include <v2_18g3.asm> 2 3.sect.data 4 5 welcome:.asciz " Factorial!" 6 7 prompt:.asciz "Fact is " blanks:.asciz " " 8 9 input:.byte 0 10.sect.text main: ldx #welcome 13 ldaa #1 // line 1 14 jsr LCDSTRING // write to LCD, expects in X 15 ldx #blanks 16 inca // line 2 17 jsr LCDSTRING // write to LCD 18 ldx #prompt 19 jsr LCDSTRING // write to LCD CMPE12 Summer
30 Example program factorial.asm (2/2) ldab SWITCHES // B SWITCHES jsr fact_start jsr LCDINT // expects input in D stab LEDS // LEDS B always: jmp always // factorial: assume input in B, output in D fact_start: stab input // input B tba // A B fact: dec input // input (input 1) ldaa input // A input beq fact_done // Z? mul // D (A B) jmp fact fact_done: rts CMPE12 Summer
31 Compiling the program CMPE12 Summer
32 CMPE12 Summer
33 Downloading the program Just drag & drop CMPE12 Summer
34 Running the program Note the LEDs: is the number correct? CMPE12 Summer
35 Recommended exercises Write and run the Fibonacci program. CMPE12 Summer
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