ATA6602 datasheet(73/362 Pages) ATMEL

Part #	ATA6602

Description	Microcontroller with LIN Transceiver, 5V Regulator and Watchdog

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Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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73

4921C–AUTO–01/07

ATA6602/ATA6603

Note:

1. The example code assumes that the part specific header file is included.

Note:

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.

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, WDTCSR

ori

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

sts

WDTCSR, r16

; Turn off WDT

ldi

r16, (0<<WDE)

sts

WDTCSR, 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 */

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

/* Turn off WDT */

WDTCSR = 0x00;

__enable_interrupt();

}

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ATA6602 Datasheet(PDF) 73 Page - ATMEL Corporation

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