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IKI10230Pengantar Organisasi Komputer

Kuliah no. A6: Bahasa Rakitan AVRI/O Instructions

4 April 2003

Bobby Nazief (nazief@cs.ui.ac.id)Qonita Shahab (niet@cs.ui.ac.id)

bahan kuliah: http://www.cs.ui.ac.id/~iki10230/

Sumber:1. AVR AT90S8515 Data Sheet.2. Materi kuliah CS152, th. 1997, UCB.

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Instruksi: I/O

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Organisasi I/O dari μC AVR

Built-in I/O, Interupsi Internal

Interupsi Eksternal

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Peta Memori Data

Akses menggunakan instruksi: IN & OUT

Akses menggunakan instruksi: LD & ST

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Alamat-alamat I/O (1)

Address Hex Name Function$3F ($5F) SREG Status Register$3E ($5E) SPH Stack Pointer High$3D ($5D) SPL Stack Pointer Low$3B ($5B) GIMSK General Interrupt MaSK Register$3A ($5A) GIFR General Interrupt Flag Register$39 ($59) TIMSK Timer/Counter Interrupt MaSK Register$38 ($58) TIFR Timer/Counter Interrupt Flag Register$35 ($55) MCUCR MCU general Control Register$33 ($53) TCCR0 Timer/Counter 0 Control Register$32 ($52) TCNT0 Timer/Counter 0 (8-bit)$2F ($4F) TCCR1A Timer/Counter 1 Control Register A$2E ($4E) TCCR1B Timer/Counter 1 Control Register B$2D ($4D) TCNT1H Timer/Counter 1 High Byte$2C ($4C) TCNT1L Timer/Counter 1 Low Byte$2B ($4B) OCR1AH Output Compare Register A High Byte$2A ($4A) OCR1AL Output Compare Register A Low Byte$29 ($49) OCR1AH Output Compare Register B High Byte$28 ($48) OCR1AL Output Compare Register B Low Byte$25 ($45) ICR1H T/C 1 Input Capture Register High Byte$24 ($44) ICR1L T/C 1 Input Capture Register Low Byte$21 ($41) WDTCR Watchdog Timer Control Register

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Alamat-alamat I/O (2)Address Hex Name Function$1B ($38) PORTA Data Register, Port A$1A ($3A) DDRA Data Direction Register, Port A$19 ($39) PINA Input Pins, Port A $18 ($38) PORTB Data Register, Port B$17 ($37) DDRB Data Direction Register, Port B$16 ($36) PINB Input Pins, Port B$15 ($35) PORTC Data Register, Port C$14 ($34) DDRC Data Direction Register, Port C$13 ($33) PINC Input Pins, Port C$12 ($32) PORTD Data Register, Port D$11 ($31) DDRD Data Direction Register, Port D$10 ($30) PIND Input Pins, Port D$0F ($2F) SPDR SPI I/O Data Register$0E ($2E) SPSR SPI I/O Status Register$0D ($2D) SPCR SPI I/O Control Register$0C ($2C) UDR UART I/O Data Register$0B ($2B) USR UART Status Register$0A ($2A) UCR UART Control Register$09 ($29) UBRR UART Baud Rate Register$08 ($28) ACSR Analog Comparator Control and Status Register

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Instruksi-instruksi I/O

° P: I/O Register

° Data Transfer:• IN Rd,P ; Rd P• OUT P,Rs ; P Rs

° Bit Operation:• SBI P,b ; P(b) 1• CBI P,b ; P(b) 0

° Branch:• SBIC P,b ; Skip if P(b) == 0 • SBIS P,b ; Skip if P(b) == 1• RETI

° Special:• SEI ; Global Interrupt Enable• CLI ; Global Interrupt Disable • WDR ; Watchdog Reset

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Simulasi Program I/O di AVR Studio

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Penggunaan Port I/O 8 bit (A,B,C,D)° Penamaan:

• PORTA,PORTB,PORTC,PORTD

• DDRA,DDRB,DDRC,DDRD (data direction)

• PINA,PINB,PINC,PIND

° Mengeset sebuah port untuk menjadi sebuah Input Port:

• out DDRD,0x00

° Mengeset sebuah port untuk menjadi sebuah Output Port:

• out DDRB,0xff

° Memasukkan data (input) dari sebuah port:• in R16,PIND

° Mengeluarkan data (output) ke sebuah port:• out PORTB,R16

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Contoh masuk/keluar data° out PORTB,0b00110101

° in R18,PIND

• isi R18 = 0b00100000

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Contoh Program: io-bd.asmldi temp,$ffout PORTB,temp ; Set all pins at port B

highout DDRB,temp ; Set port B as output

ldi temp,$00out PIND,temp ; Set all pins at port D lowout DDRD,temp ; Set port D as input

ldi count,5rjmp show_inputs

show_inputs:nop ; only in simulatorin temp,PIND ; get inputout PORTB,temp ; output the datadec countcpi count,0brne show_inputs

quit: rjmp quit

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STK200: board untuk percobaan I/O° Port B: LED

° Port D: tombol-tombol

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Penggunaan STK200° Prosesor AVR ditancapkan di STK200 board

° Kabel ke parallel port di PC

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Referensi° AVR Assembler User Guide

° http://www.avr-asm-tutorial.net

° <AVR installation dir>\appnotes\*.asm

° AVR AT90S8515 Data Sheets