Rainbow-electronics ATmega64L Manual de usuario descargar pdf (Pagina 41)

100

101

ATmega16(L)

2466B–09/01

Note: 1. Values are guidelines only. Actual values are TBD.

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

WDT. The example assumes that interrupts are controlled (for example by disabling

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

Table 17. Watchdog Timer Prescale Select

(1)

WDP2 WDP1 WDP0

Number of WDT

Oscillator Cycles

Typical Time-out

at V

= 3.0V

Typical Time-out

at V

= 5.0V

000 16K TBD 16 ms

001 32K TBD 32 ms

010 64K TBD 64 ms

0 1 1 128K TBD 0.13 s

1 0 0 256K TBD 0.26 s

1 0 1 512K TBD 0.5 s

1 1 0 1,024K TBD 1.0 s

1 1 1 2,048K TBD 2.0 s

Assembly Code Example

WDT_off:

; Write logical one to WDTOE and WDE

ldi r16, (1<<WDTOE)|(1<<WDE)

out WDTCR, r16

; Turn off WDT

ldi r16, (0<<WDE)

out WDTCR, r16

ret

C Code Example

void WDT_off(void)

{

/* Write logical one to WDTOE and WDE */

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

/* Turn off WDT */

WDTCR = 0x00;

}

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