8-bit AVR Microcontroller

12.5.3 Code Examples

The following code example shows how to turn off the WDT. The example assumes that interrupts are controlled (e.g., by disabling interrupts globally) so that no interrupts will occur during execution of these functions.

Assembly Code Example
WDT_off: wdr ; Clear WDRF in RSTFLR in r16, RSTFLR andi r16, ~(1<<WDRF) out RSTFLR, r16 ; Write signature for change enable of protected I/O register ldi r16, 0xD8 out CCP, r16 ; Within four instruction cycles, turn off WDT ldi r16, (0<<WDE) out WDTCSR, r16 ret

Assembly Code Example

WDT_off:
wdr
; Clear WDRF in RSTFLR
in r16, RSTFLR
andi r16, ~(1<<WDRF)
out RSTFLR, r16
; Write signature for change enable of protected I/O register
ldi r16, 0xD8
out CCP, r16
; Within four instruction cycles, turn off WDT
ldi r16, (0<<WDE)
out WDTCSR, r16
ret

Note: See About Code Examples.

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