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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATmega32U2 датащи(PDF) 54 Page - ATMEL Corporation |
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ATmega32U2 датащи(HTML) 54 Page - ATMEL Corporation |
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54 / 314 page  54 7799B–AVR–07/09 ATmega8U2/16U2/32U2 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 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. 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(); } |
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