Rainbow-electronics ATtiny2313 Manuale Utente Scaricare il pdf (Pagina 43)

ATtiny2313

2543A–AVR–08/03

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.

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

Assembly Code Example

(1)

WDT_off:

WDR

; Clear WDRF in MCUSR

ldi r16, (0<<WDRF)

out MCUSR, r16

; Write logical one to WDCE and WDE

; Keep old prescaler setting to prevent unintentional Watchdog Reset

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

(1)

void WDT_off(void)

{

_WDR();

/* Clear WDRF in MCUSR */

MCUSR = 0x00;

/* Write logical one to WDCE and WDE */

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

/* Turn off WDT */

WDTCR = 0x00;

}

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Rainbow-electronics ATtiny2313 Manuale Utente Pagina 43