ATtiny13 >> Assembly

Watchdog

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本練習使用Watchdog Interrupt模式(不會執行Reset)，因此，Watchdog觸發後，會從Sleep指令繼續往下執行


main.s

  .equ PINB,  0x16
  .equ DDRB,  0x17
  .equ PORTB, 0x18
  .equ WDTCR, 0x21
  .equ MCUSR, 0x34
  .equ MCUCR, 0x35
   
  .equ LED,   1
   
  .org 0x0000
  rjmp main
  reti
  reti
  reti
  reti
  reti
  reti
  reti
  reti
  reti

  .org 0x0020
main:
  sbi DDRB, LED
  sbi PORTB, LED
  ldi r16, 0x30
  out MCUCR, r16
  ldi r16, 0x60
  out WDTCR, r16
  sei
  sleep
  cbi PORTB, 1
 
loop:
  rjmp loop

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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