ATmega328P datasheet(51/448 Pages) ATMEL

Teilenummer	ATmega328P

Bauteilbeschribung	8-bit Microcontroller with 4/8/16/32K Bytes In-System Programmable Flash

PDF	448 Pages

Scroll/Zoom	100%

Hersteller	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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51 / 448 page

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:

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.

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.

ATmega328P Datenblatt(PDF) 51 Page - ATMEL Corporation