Advanced Embedded Microcontroller Seminar References
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Advanced Embedded Microcontroller Seminar Andrew Huang [email protected] IAP 1999 Microcontroller Seminar -- ASH References • Portions of these lecture slides come from – MIPS technical documentation – Hitachi tech docs – Microchip tech docs – ARM tech docs Microcontroller Seminar -- ASH 1 Agenda • Day 1: 1/19 -- get to know the big picture – what is a microcontroller? – microcontroller applications – overview of microcontrollers – architectural case studies – design-in considerations Microcontroller Seminar -- ASH Agenda • Day 2: 1/21 -- getting into the SH-1 and SH1WH – Designing the SH-1 into your system – Details of the SH1 integrated peripherals – Overview of the SH1WH, on-board peripheral specs – development environment – sleep modes – reprogramming the FLASH Microcontroller Seminar -- ASH 2 Agenda • Day 3: 1/22 -- everything else you need to know to do something with the SH-1 – example: digital I/O and the RTC, FPGA expansions – example: PWM controller – example: tachometer – example: DMA, ITU, TPC – using the MAC – idea session, Q&A – prep for hands-on session next week Microcontroller Seminar -- ASH Agenda • Hands-on sessions – free-form schedule – held in 34-501 (6.004 teaching lab) – for you to experiment with your SH1WH board and gain confidence in using it – for you to develop any applications you’d like to do with your SH1WH board – your ideas and projects are welcome! Microcontroller Seminar -- ASH 3 Using the Right Tool • A Leatherman™ is great, but you wouldn’t want to cut down a tree or build a house with it • On the same token, the PIC is a great processor, but its not the right tool for every job Microcontroller Seminar -- ASH Alphabet Soup CISC CPU SHARC 8085 MIPS MCU VLIW PowerPC 486 Dragonball PIC RISC DSP MPU i960 ARM 6811 SH-RISC Microcontroller Seminar -- ASH 4 Microcontrollers All • Microcontroller – an application-specific processor – PIC vs. StrongArm: it all depends on your application • Typically, microcontrollers... – are low cost, lightweight processors – require few support components for better system integration – come with integrated peripherals • Let’s take a look at what other engineers use... Microcontroller Seminar -- ASH Some numbers... High-end microcontroller applications: Product Description Processor Speed Memory Sega Dreamcast video game SH-4, ARM for sound processing 200 MHz 16M main 8M vid 2M sound Nintendo 64 video game MIPS VR4300i 100 MHz 4M RAMBUS Sony Playstation video game 3000A MIPS core 33 MHz 2MB + 1MB vid, .5 MB snd empeg car stereo, MP3 SA 220 MHz 28 Gb HD storage e-book electronic book ARM can't read japanese pocket station PDA/playstation ARM7T 128K RAM QCP800 cell phone 80188 core ND not discloseable HP4000 laserjet printer NEC MIPS 4300 100 MHz 4 MB RAM standard LaserJet 6P printer i960JF 24 MHz 2 MB RAM standard windows CE PDA PDA MIPS 3K and 4K series 2-8 MB RAM LaserJet 5MP printer i960JF 35 MHz 4 MB RAM standard E-11 Cassiopia PDA VR4111 70 MHz(?) 8 MB , windows CE Cisco 7202 gateway MIPS 4700 150 MHz 1MB SRAM/32MB DRAM Palm Pilot III PDA Motorola Dragonball MC68328 16 MHz 2MB RAM digital camera casio SH-2@20 MHz 20 MHz Microcontroller Seminar -- ASH 5 More numbers... • 6811 and the 8085 series microcontrollers are popular in automotive industry • PICs are popping up everywhere you require low cost and low performance, i.e. inside batteries, mice, toys, RFID, secure remotes • 80188-class controllers are in hard drives • Most japanese equipment use proprietary or “obscure” microcontrollers – NEC has a huge line of 4, 8, 16 and 32 bit microcontrollers that are great in consumer applications, but little known in the states •16-bit K4 • 32-bit V-800 • 4-bit 75XL • 8-bit KO/S Microcontroller Seminar -- ASH Where do you find a microcontroller? •Cars – engine ignition, emissions control, ABS brakes, security • Entertainment systems, consumer multimedia – front-panel displays, system functions – video game decks • Appliances – timers, user interfaces, regulation of appliance functions • Printers – image rasterizers, printer language interpretation • Networking equipment – Routers, gateways • Personal communications equipment – cell phones, cordless phones, smart cards • Computers – IDE/SCSI hard drives, modems, high-end storage (I2O), keyboard • Batteries – controls charging, discharge, gas guage Microcontroller Seminar -- ASH 6 Getting a Better Feel • The microcontroller extremes: –PIC • a few tens of cents in large qty. • packages from 8 pins to 68 pins; typ. 16 to 20 pins • memory capacity from 256 bytes ROM to a few K, 20 bytes RAM to a few hundred bytes RAM • top speeds from 4 MHz to 33 MHz – Hitachi SH-4 • around $80 in small qty. •256-pin BGA • 32-bit RISC, 200 MHz top speed • vector FP unit for 1.4 GFLOPs in 3D applications • 8/16K D/I caches • Memory space to 4 GB, virtual memory support Microcontroller Seminar -- ASH Did you know? • The 8086 line was originally designed to be a microcontroller for industrial and appliance control--it was never intended to be a powerful general-purpose PC processor. To date, it is still popular in many embedded applications. Microcontroller Seminar -- ASH 7 Architectural Case Studies •PIC – low cost, low performance “penny micro” •ARM – ARM is fabless, licenses IP and cores •MIPS – ubiquitous, venerable line spanning several generations • Intel i960 – found in many computer peripherals, incl. printers and I2O (intelligent I/O) controllers • Motorola 6811 – legacy architecture, still popular in many low-end sectors •SH-series – scalable family of microcontrollers Microcontroller Seminar -- ASH PIC • Large family of CPUs – 8, 12, 14 and 16 bit variants – 4 MHz to 33 MHz – variety of embedded peripherals and low-cost package options • Typical PIC: 16C84 – 1Kx14 EEPROM, 36x8 RAM, 64x8 EEPROM data memory – 35 RISC-style instructions, 4-stage pipeline – semi-accumulator style ALU (“W” register, no register file per se) – 8-bit harvard (separate I/D mems) architecture – integrated watchdog timer and timer unit –10 mW Pdiss – $7 single qty through digi-key Microcontroller Seminar -- ASH 8 PIC16C84 block diagram 13 Data Bus 8 Program Counter EEPROM EEPROM Data Memory Program Memory 1K x 14 RAM EEPROM 8 Level Stack File Registers EEDATA Data Memory (13-bit) 36 x 8 64 x 8 Program Bus 14 7 RAM Addr EEADR Addr Mux Instruction reg 5 Direct Addr 7 Indirect TMR0 Addr FSR reg RA4/T0CKI STATUS reg 8 MUX Power-up Timer I/O Ports Instruction Oscillator Decode & Start-up Timer Control ALU Power-on RA3:RA0 Reset Watchdog Timing W reg RB7:RB1 Generation Timer RB0/INT OSC2/CLKOUT MCLR VDD, VSS OSC1/CLKIN Microcontroller Seminar -- ASH PIC 16CXX ISA Mnemonic, Description Cycles 14-Bit Opcode Status Notes Operands MSb LSb Affected BYTE-ORIENTED FILE REGISTER OPERATIONS ADDWF f, d Add W and f 1 00 0111 dfff ffff C,DC,Z 1,2 ANDWF f, d AND W with f 1 00 0101 dfff ffff Z 1,2 CLRF f Clear f 1 00 0001 lfff ffff Z 2 CLRW - Clear W 1 00 0001 0xxx xxxx Z COMF f, d Complement f 1 00 1001 dfff ffff Z 1,2 DECF f, d Decrement f 1 00 0011 dfff ffff Z 1,2 DECFSZ f, d Decrement f, Skip if 0 1(2) 00 1011 dfff ffff 1,2,3 INCF f, d Increment f 1 00 1010 dfff ffff Z 1,2 INCFSZ f, d Increment f, Skip if 0 1(2) 00 1111 dfff ffff 1,2,3 IORWF f, d Inclusive OR W with f 1 00 0100 dfff ffff Z 1,2 MOVF f, d Move f 1 00 1000 dfff ffff Z 1,2 MOVWF f Move W to f 1 00 0000 lfff ffff NOP - No Operation 1 00 0000 0xx0 0000 RLF f, d Rotate Left f through Carry 1 00 1101 dfff ffff C 1,2 RRF f, d Rotate Right f through Carry 1 00 1100 dfff ffff C 1,2 SUBWF f, d Subtract W from f 1 00 0010 dfff ffff C,DC,Z 1,2 SWAPF f, d Swap nibbles in f 1 00 1110 dfff ffff 1,2 XORWF f, d Exclusive OR W with f 1 00 0110 dfff ffff Z 1,2 BIT-ORIENTED FILE REGISTER OPERATIONS BCF f, b Bit Clear f 1 01 00bb bfff ffff 1,2 BSF f, b Bit Set f 1 01 01bb bfff ffff 1,2 BTFSC f, b Bit Test f, Skip if Clear 1 (2) 01 10bb bfff ffff 3 BTFSS f, b Bit Test f, Skip if Set 1 (2) 01 11bb bfff ffff 3 LITERAL AND CONTROL OPERATIONS ADDLW k Add literal and W 1 11 111x kkkk kkkk C,DC,Z ANDLW k AND literal with W 1 11 1001 kkkk kkkk Z CALL k Call subroutine 2 10 0kkk kkkk kkkk CLRWDT - Clear Watchdog Timer 1 00 0000 0110 0100 TO,PD GOTO k Go to address 2 10 1kkk kkkk kkkk IORLW k Inclusive OR literal with W 1 11 1000 kkkk kkkk Z MOVLW k Move literal to W 1 11 00xx kkkk kkkk RETFIE - Return from interrupt 2 00 0000 0000 1001 RETLW k Return with literal in W 2 11 01xx kkkk kkkk RETURN - Return from Subroutine 2 00 0000 0000 1000 SLEEP - Go into standby mode 1 00 0000 0110 0011 TO,PD SUBLW k Subtract W from literal 1 11 110x kkkk kkkk C,DC,Z XORLW k Exclusive OR literal with W 1 11 1010 kkkk kkkk Z Microcontroller Seminar -- ASH 9 PIC architecture • Very cost-oriented architecture – sacrifices scalability, performance, and expandability – excellent for simple control applications • Tiny instruction set can make programming difficult – no hardware mult/div – small memory => no complex structures – assembly coding is more tedious • Where might you use a PIC? – controller for appliances – controller for LCDs, other devices • Incidentally: – for slightly more than the cost of a PIC16C84, you can buy a 5K- gate, 360 flip-flop FPGA that has performance to 100+ MHz and has 74 I/Os Microcontroller Seminar -- ASH ARM • ARM Holdings, plc.