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ATmega128
The following code example shows one assembly and one C function for turning off the W DT.
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:
; Reset WDT
wdr
in r16, WDTCR
; Write logical one to WDCE and WDE
ori r16, (1<<WDCE)|(1<<WDE)
out WDTCR, r16
; Turn off WDT
ldi r16, (0<<WDE)
out WDTCR, r16
ret
C Code Example
void WDT_off( void )
{
/* Reset WDT */
__watchdog_reset();
/* Write logical one to WDCE and WDE */
WDTCR |= (1<<WDCE) | (1<<WDE);
/* Turn off WDT */
WDTCR = 0x00;
}
Timed Sequences for Changing the Configuration of the Watchdog Timer
The sequence for changing configuration differs slightly between the three safety levels. Sepa-
rate procedures are described for each level.
Safety Level 0
Safety Level 1
Safety Level 2
This mode is compatible with the W atchdog operation found in ATmega103. The W atchdog
Timer is initially disabled, but can be enabled by writing the W DE bit to 1 without any restriction.
The time-out period can be changed at any time without restriction. To disable an enabled
W atchdog Timer, the procedure described on page 55 ( W DE bit description) must be followed.
In this mode, the W atchdog Timer is initially disabled, but can be enabled by writing the W DE bit
to 1 without any restriction. A timed sequence is needed when changing the W atchdog Time-out
period or disabling an enabled W atchdog Timer. To disable an enabled W atchdog Timer, and/or
changing the W atchdog Time-out, the following procedure must be followed:
1. In the same operation, write a logic one to W DCE and W DE. A logic one must be written
to W DE regardless of the previous value of the W DE bit.
2. W ithin the next four clock cycles, in the same operation, write the W DE and W DP bits as
desired, but with the W DCE bit cleared.
In this mode, the W atchdog Timer is always enabled, and the W DE bit will always read as one. A
timed sequence is needed when changing the W atchdog Time-out period. To change the
W atchdog Time-out, the following procedure must be followed:
57
2467X–AVR–06/11
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