1. 1 IKI10230 Pengantar Organisasi Komputer Kuliah no. A6: Bahasa Rakitan AVR I/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.

2. 2 Instruksi: I/O

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

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

5. 5 Alamat-alamat I/O (1) Address Hex NameFunction $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. 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) DDRCData 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) USRUART Status Register $0A ($2A) UCRUART Control Register $09 ($29) UBRR UART Baud Rate Register $08 ($28) ACSR Analog Comparator Control and Status Register

7. 7 Instruksi-instruksi I/O °P: I/O Register °Data Transfer: INRd,P; Rd  P OUTP,Rs; P  Rs °Bit Operation: SBIP,b; P(b)  1 CBIP,b; P(b)  0 °Branch: SBICP,b; Skip if P(b) == 0 SBISP,b; Skip if P(b) == 1 RETI °Special: SEI; Global Interrupt Enable CLI; Global Interrupt Disable WDR; Watchdog Reset

8. 8 Simulasi Program I/O di AVR Studio

9. 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: outDDRD,0x00 °Mengeset sebuah port untuk menjadi sebuah Output Port: outDDRB,0xff °Memasukkan data (input) dari sebuah port: inR16,PIND °Mengeluarkan data (output) ke sebuah port: outPORTB,R16

10. 10 Contoh masuk/keluar data °outPORTB,0b00110101 °inR18,PIND isi R18 = 0b00100000

11. 11 Contoh Program: io-bd.asm lditemp,$ff outPORTB,temp; Set all pins at port B high outDDRB,temp; Set port B as output lditemp,$00 outPIND,temp; Set all pins at port D low outDDRD,temp; Set port D as input ldicount,5 rjmpshow_inputs show_inputs: nop; only in simulator intemp,PIND; get input outPORTB,temp; output the data deccount cpicount,0 brne show_inputs quit:rjmp quit

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

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

14. 14 Referensi °AVR Assembler User Guide °http://www.avr-asm-tutorial.nethttp://www.avr-asm-tutorial.net ° \appnotes\*.asm °AVR AT90S8515 Data Sheets