IKI10230 Pengantar Organisasi Komputer Kuliah no. A6: Bahasa Rakitan AVR I/O Instructions

1. IKI10230Pengantar Organisasi KomputerKuliah no. A6: Bahasa Rakitan AVRI/O Instructions Sumber:1. AVR AT90S8515 Data Sheet.2. Materi kuliah CS152, th. 1997, UCB. 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/

2. Instruksi: I/O

3. Organisasi I/O dari μC AVR Interupsi Eksternal Built-in I/O, Interupsi Internal

4. Peta Memori Data Akses menggunakan instruksi: IN & OUT Akses menggunakan instruksi: LD & ST

5. 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

6. 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

7. 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

8. Simulasi Program I/O di AVR Studio

9. 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

10. Contoh masuk/keluar data • out PORTB,0b00110101 • in R18,PIND • isi R18 = 0b00100000

11. Contoh Program: io-bd.asm ldi temp,$ff out PORTB,temp ; Set all pins at port B high out DDRB,temp ; Set port B as output ldi temp,$00 out PIND,temp ; Set all pins at port D low out DDRD,temp ; Set port D as input ldi count,5 rjmp show_inputs show_inputs: nop ; only in simulator in temp,PIND ; get input out PORTB,temp ; output the data dec count cpi count,0 brne show_inputs quit: rjmp quit

12. STK200: board untuk percobaan I/O • Port B: LED • Port D: tombol-tombol

13. Penggunaan STK200 • Prosesor AVR ditancapkan di STK200 board • Kabel ke parallel port di PC

14. Referensi • AVR Assembler User Guide • http://www.avr-asm-tutorial.net • <AVR installation dir>\appnotes\*.asm • AVR AT90S8515 Data Sheets