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ATMEGA640 Datasheet(PDF) 63 Page - ATMEL Corporation

Part # ATMEGA640
Description  8-bit Microcontroller with 64K/128K/256K Bytes In-System Programmable Flash
PDF  449 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATMEGA640 Datasheet(HTML) 63 Page - ATMEL Corporation

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63
ATmega640/1280/1281/2560/2561
2549K–AVR–01/07
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 previ-
ous 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
Watchdog 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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