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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATtiny13A-SSH датащи(PDF) 41 Page - ATMEL Corporation |
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ATtiny13A-SSH датащи(HTML) 41 Page - ATMEL Corporation |
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41 / 174 page  41 8126D–AVR–11/09 ATtiny13A tion, the application software should always clear the Watchdog System Reset Flag (WDRF) and the WDE control bit in the initialisation routine, even if the Watchdog is not in use. The following code example shows one assembly and one C function for changing the time-out value of the Watchdog Timer. Note: See “Code Examples” on page 6. The Watchdog Timer should be reset before any change of the WDP bits, since a change in the WDP bits can result in a time-out when switching to a shorter time-out period. Assembly Code Example WDT_Prescaler_Change: ; Turn off global interrupt cli ; Reset Watchdog Timer wdr ; Start timed sequence in r16, WDTCR ori r16, (1<<WDCE) | (1<<WDE) out WDTCR, r16 ; -- Got four cycles to set the new values from here - ; Set new prescaler(time-out) value = 64K cycles (~0.5 s) ldi r16, (1<<WDE) | (1<<WDP2) | (1<<WDP0) out WDTCR, r16 ; -- Finished setting new values, used 2 cycles - ; Turn on global interrupt sei ret C Code Example void WDT_Prescaler_Change(void) { __disable_interrupt(); __watchdog_reset(); /* Start timed sequence */ WDTCR |= (1<<WDCE) | (1<<WDE); /* Set new prescaler(time-out) value = 64K cycles (~0.5 s) */ WDTCR = (1<<WDE) | (1<<WDP2) | (1<<WDP0); __enable_interrupt(); } |
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