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Prof. Jorge A. Ramón

Prof. Jorge A. Ramón. Introducción a Microcontroladores. Microcontroller. Microprocessor. VS. CISC Architecture Many pins Many instructions External devices needed for operation (memory, I/O, etc). RISC Architecture Fewer pins Fewer instructions

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Prof. Jorge A. Ramón

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  1. Prof. Jorge A. Ramón Introducción a Microcontroladores

  2. Microcontroller Microprocessor VS • CISC Architecture • Many pins • Many instructions • External devices needed for operation (memory, I/O, etc) • RISC Architecture • Fewer pins • Fewer instructions • No external devices needed for operation (memory, I/O, etc are already built into IC)

  3. Bloque #1 Unidad de Memoria

  4. Bloque #2 Unidad Central de Procesamiento

  5. Bloque #3 Unidad entrada y salida

  6. Bloque #4 Unidad de comunicación en serie

  7. Bloque #5 Unidad de Timer

  8. Bloque #6 Unidad ADC

  9. Conexión entre todas las unidades.

  10. Microchip PIC16F84 Microcontroller Outline 68 bytes 8 bits 1K x 14 35 instructions 64 bytes 5 bits 8 bits

  11. Clock / Instruction Cycle • Q1  Instruction Fetch • Q2  Instruction Decode • Q3  Execute • Q4  Write Back Pipelining: each instruction is executed in one cycle. Two cycles for JUMP and CALL instructions .

  12. PORTA Configuration

  13. PORTB Configuration

  14. PIC16F84 Register File

  15. PIC16F84 Status Register

  16. Instruction Set Summary • Byte Oriented • Bit Oriented • Literal • Control Operations Only 35 instructions!! Impressive!!!

  17. Byte Oriented • CLRF • DECF • INCF • ADDWF

  18. Bit Oriented • BCF • BSF

  19. Literal • MOVLW • ADDLW • ANDLW • IORLW • XORLW

  20. Control Operations • CALL • RETURN • GOTO • SLEEP

  21. Programming Example Setting PORTB as Output • Set RP0 in Status Register to switch to BANK1. This allows access to TRISB. • Write 0x00 into TRISB. • Clear RP0 in Status Register to switch to BANK0. This allows access to PORTB.

  22. Programming Example Setting PORTB as Output • BSF STATUS, RP0 • MOVLW 0x00 • MOVWF TRISB • BCF STATUS, RP0 • MOVLW 0xFF • MOVWF PORTB

  23. Assembly Programming Steps to write some code • Tell the assembler which MPU you are using. • Include the header file. • Set PC to 0 • Write some code • Keep an endless loop. • Use the end directive.

  24. PIC16F84 Schematic Diagram

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