ATtiny13 >> Assembly

Pin Change Interrupt

---

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

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