Rainbow-electronics ATmega162V Manual do Utilizador descarregar pdf (Página 54)

100

101

ATmega162/V

2513E–AVR–09/03

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

; Reset WDT

WDR

; Write logical one to WDCE and WDE

in r16, WDTCR

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*/

_WDR()

/* Write logical one to WDCE and WDE */

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

/* Turn off WDT */

WDTCR = 0x00;

}

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