ATA6616_12 datasheet(78/308 Pages) ATMEL

Part #	ATA6616

Description	8K/16K Flash Microcontroller with LIN Transceiver, 5V Regulator and Watchdog

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Manufacturer	ATMEL [ATMEL Corporation]

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9132F–AUTO–02/12

Atmel ATA6616/ATA6617

The following code example shows one assembly and one C function for turning off the

Watchdog Timer. The example assumes that interrupts are controlled (e.g. by disabling inter-

rupts globally) so that no interrupts will occur during the execution of these functions.

Assembly Code Example

(1)

WDT_off:

; Turn off global interrupt

cli

; Reset Watchdog Timer

wdr

; Clear WDRF in MCUSR

in

r16, MCUSR

andi

r16, (0xff & (0<<WDRF))

out

MCUSR, r16

; Write logical one to WDCE and WDE

; Keep old prescaler setting to prevent unintentional time-out

lds

r16, WDTCR

ori

r16, (1<<WDCE) | (1<<WDE)

sts

WDTCR, r16

; Turn off WDT

ldi

r16, (0<<WDE)

sts

WDTCR, r16

; Turn on global interrupt

sei

ret

C Code Example

(1)

void WDT_off(void)

{

__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 */

WDTCR |= (1<<WDCE) | (1<<WDE);

/* Turn off WDT */

WDTCR = 0x00;

__enable_interrupt();

}

Notes:

1. See Section 4.2.7 “About Code Examples” on page 31

2. 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 handle 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 Watch-

dog is not in use

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