ATtiny13 >> Assembly

Timer

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本範例使用Prescaler 1024，當Timer Overflow時，觸發中斷，在中斷裡面Toggle LED


main.s

  .equ DDRB,   0x17
  .equ PORTB,  0x18
  .equ TIMSK0, 0x39 
  .equ TCNT0,  0x32
  .equ TCCR0B, 0x33
   
  .equ LED,    1
   
  .org 0x0000
  rjmp main
  reti
  reti
  rjmp timer_handler

  .org 0x0020
main:
  sbi DDRB, LED
  sbi PORTB, LED
  ldi r16, 0x00
  out TCNT0, r16
  ldi r16, 0x02
  out TIMSK0, r16
  ldi r16, 0x05
  out TCCR0B, r16
  ldi r16, 0x01
  ldi r17, 0
  sei
 
loop:
  rjmp loop

timer_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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