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ATmega644PA датащи(PDF) 61 Page - ATMEL Corporation

номер детали ATmega644PA
подробное описание детали  8-bit Microcontroller with 16/32/64/128K Bytes In-Sytem Programmable Flash
PDF  468 Pages
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производитель  ATMEL [ATMEL Corporation]
домашняя страница  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega644PA датащи(HTML) 61 Page - ATMEL Corporation

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61
8152G–AVR–11/09
ATmega164PA/324PA/644PA/1284P
• Bit 5, 2:0 - WDP3:0: Watchdog Timer Prescaler 3, 2, 1 and 0
The WDP3:0 bits determine the Watchdog Timer prescaling when the Watchdog Timer is run-
ning. The different prescaling values and their corresponding time-out periods are shown in
Table 10-2 on page 61.
.
Table 10-2.
Watchdog Timer Prescale Select
WDP3
WDP2
WDP1
WDP0
Number of WDT Oscillator
Cycles
Typical Time-out at
VCC = 5.0V
0000
2K (2048) cycles
16 ms
0001
4K (4096) cycles
32 ms
0010
8K (8192) cycles
64 ms
0011
16K (16384) cycles
0.125 s
0100
32K (32768) cycles
0.25 s
0101
64K (65536) cycles
0.5 s
0110
128K (131072) cycles
1.0 s
0111
256K (262144) cycles
2.0 s
1000
512K (524288) cycles
4.0 s
1001
1024K (1048576) cycles
8.0 s
1010
Reserved
1011
1100
1101
1110
1111



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