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ATTINY2313-20MU データシート(PDF) 43 Page - ATMEL Corporation

部品番号 ATTINY2313-20MU
部品情報  8-bit Microcontroller with 2K Bytes In-System Programmable Flash
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メーカー  ATMEL [ATMEL Corporation]
ホームページ  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATTINY2313-20MU データシート(HTML) 43 Page - ATMEL Corporation

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43
ATtiny2313/V
2543I–AVR–04/06
The following code example shows one assembly and one C function for turning off the
Watchdog Timer. The example assumes that interrupts are controlled (e.g. by disabling
interrupts globally) so that no interrupts will occur during the execution of these
functions.
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 handle the Watchdog, this might lead to an eternal loop of
time-out resets. To avoid this situation, the application software should always clear the
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
in
r16, WDTCSR
ori
r16, (1<<WDCE) | (1<<WDE)
out
WDTCSR, r16
; Turn off WDT
ldi
r16, (0<<WDE)
out
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();
}


同様の部品番号 - ATTINY2313-20MU

メーカー部品番号データシート部品情報
logo
ATMEL Corporation
ATTINY2313-20MU ATMEL-ATTINY2313-20MU Datasheet
181Kb / 17P
   8-bit Microcontroller with 2K Bytes In-System Programmable Flash
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同様の説明 - ATTINY2313-20MU

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