微處理器 - Microchip ATtiny13 - Assembly - Pin Change Interrupt

參考資訊：
https://www.microchip.com/en-us/product/attiny13#Documentation
https://nerdathome.blogspot.com/2008/04/avr-as-usage-tutorial.html

Pin Change Interrupt Enable


PCINT0


main.s

    .equ PCMSK, 0x15
    .equ PINB,  0x16
    .equ DDRB,  0x17
    .equ PORTB, 0x18
    .equ GIMSK, 0x3b
  
    .equ BTN,   0
    .equ LED,   1
  
    .org 0x0000
    rjmp main
    reti
    rjmp pcint0_handler
  
    .org 0x0010
main:
    sbi DDRB, LED
    cbi DDRB, BTN
    sbi PORTB, LED
    sbi PORTB, BTN
    ldi r16, 0x20
    out GIMSK, r16
    ldi r16, 0x01
    out PCMSK, r16
    ldi r17, 0
    sei
  
loop:
    rjmp loop

pcint0_handler:
    sbrs r17, 0
    cbi PORTB, LED
    sbrc r17, 0
    sbi PORTB, LED
    eor r17, r16
    reti

編譯和燒錄

$ avr-as -mmcu=attiny13 -o main.o main.s
$ avr-ld -o main.elf main.o
$ avr-objcopy --output-target=ihex main.elf main.ihex
$ sudo avrdude -c usbasp -p t13 -B 1024 -U flash:w:main.ihex:i

完成