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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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ATmega328P 데이터시트(PDF) 51 Page - ATMEL Corporation |
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ATmega328P 데이터시트(HTML) 51 Page - ATMEL Corporation |
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51 / 448 page  51 8161D–AVR–10/09 ATmega48PA/88PA/168PA/328P mode bit (WDIE) are locked to 1 and 0 respectively. To further ensure program security, altera- tions to the Watchdog set-up must follow timed sequences. The sequence for clearing WDE and changing time-out configuration is as follows: 1. In the same operation, write a logic one to the Watchdog change enable bit (WDCE) and WDE. A logic one must be written to WDE regardless of the previous value of the WDE bit. 2. Within the next four clock cycles, write the WDE and Watchdog prescaler bits (WDP) as desired, but with the WDCE bit cleared. This must be done in one operation. The following code example shows one assembly and one C function for turning off the Watch- dog 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. |
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