ATA6613 ATMEL Corporation, ATA6613 Datasheet - Page 76

• Manufacturer Part Number: ATA6613
• Description: Ata6613
• Manufacturer: ATMEL Corporation

76
ATA6612/ATA6613
Note:
Note:
Assembly Code Example
C Code Example
WDT_off:
void WDT_off(void)
{
}
; Turn off global interrupt
cli
; Reset Watchdog Timer
wdr
; Clear WDRF in MCUSR
in
andi
out
; Write logical one to WDCE and WDE
; Keep old prescaler setting to prevent unintentional time-out
lds r16, WDTCSR
ori
sts WDTCSR, r16
; Turn off WDT
ldi
sts WDTCSR, r16
; Turn on global interrupt
sei
ret
__disable_interrupt();
__watchdog_reset();
/* Clear WDRF in MCUSR */
MCUSR &= ~(1<<WDRF);
/* Write logical one to WDCE and WDE */
/* Keep old prescaler setting to prevent unintentional time-out */
WDTCSR |= (1<<WDCE) | (1<<WDE);
/* Turn off WDT */
WDTCSR = 0x00;
__enable_interrupt();
1. The example code assumes that the part specific header file is included.
If the Watchdog is accidentally enabled, for example by a runaway pointer or brown-out condition,
the device will be reset and the Watchdog Timer will stay enabled. If the code is not set up to han-
dle the Watchdog, this might lead to an eternal loop of time-out resets. To avoid this situation, the
application software should always clear the Watchdog System Reset Flag (WDRF) and the WDE
control bit in the initialization routine, even if the Watchdog is not in use.
r16, MCUSR
r16, (0xff & (0<<WDRF))
MCUSR, r16
r16, (1<<WDCE) | (1<<WDE)
r16, (0<<WDE)
(1)
(1)
9111C–AUTO–02/08