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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATtiny167-ESSZ датащи(PDF) 55 Page - ATMEL Corporation |
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ATtiny167-ESSZ датащи(HTML) 55 Page - ATMEL Corporation |
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55 / 282 page  55 7728D–AVR–07/09 ATtiny87/ATtiny167 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 inter- rupts globally) so that no interrupts will occur during the execution of these functions. Note: 1. See ”About Code Examples” on page 6. Note that 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 Watchdog Sys- tem Reset Flag (WDRF) and the WDE control bit in the initialization routine, even if the Watchdog is not in use. 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 lds r16, WDTCR ori r16, (1<<WDCE) | (1<<WDE) sts WDTCR, r16 ; Turn off WDT ldi r16, (0<<WDE) sts WDTCR, 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 */ WDTCR |= (1<<WDCE) | (1<<WDE); /* Turn off WDT */ WDTCR = 0x00; __enable_interrupt(); } |
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