ATtiny261A datasheet(44/292 Pages) ATMEL

Il numero della parte	ATtiny261A

Spiegazioni elettronici	8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash

PDF	292 Pages

Scroll/Zoom	100%

Produttore elettronici	ATMEL [ATMEL Corporation]

Homepage	http://www.atmel.com

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8197A–AVR–10/09

ATtiny261A/461A/861A

1. In the same operation, write a logical one to WDCE and WDE. Even though the WDE

always is set, the WDE must be written to one to start the timed sequence.

2. Within the next four clock cycles, in the same operation, write the WDP bits as desired,

but with the WDCE bit cleared. The value written to the WDE bit is irrelevant.

8.4.2

Code Examples

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:

See “Code Examples” on page 6.

Assembly Code Example

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

r16, WDTCSR

ori

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

out

WDTCSR, r16

; Turn off WDT

ldi

r16, (0<<WDE)

out

WDTCSR, r16

ret

C Code Example

void

WDT_off(void)

{

_WDR();

/* Clear WDRF in MCUSR */

MCUSR = 0x00

/* Write logical one to WDCE and WDE */

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

/* Turn off WDT */

WDTCSR = 0x00;

}

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