ATMEGA164P_14 Datasheet, PDF (59/377 Pages) ATMEL Corporation – High-performance, Low-power Atmel

ATmega164P/324P/644P
• 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 9-2 on page 59.
.
Table 9-2. Watchdog Timer Prescale Select
WDP3
0
WDP2
0
WDP1
0
WDP0
0
Number of WDT Oscillator
Cycles
2K (2048) cycles
Typical Time-out at
V_CC = 5.0V
16 ms
0
0
0
1
4K (4096) cycles
32 ms
0
0
1
0
8K (8192) cycles
64 ms
0
0
1
1
16K (16384) cycles
0.125 s
0
1
0
0
32K (32768) cycles
0.25 s
0
1
0
1
64K (65536) cycles
0.5 s
0
1
1
0
128K (131072) cycles
1.0 s
0
1
1
1
256K (262144) cycles
2.0 s
1
0
0
0
512K (524288) cycles
4.0 s
1
0
0
1
1024K (1048576) cycles
8.0 s
1
0
1
0
1
0
1
1
1
1
0
0
1
1
0
1
Reserved
1
1
1
0
1
1
1
1
59
7674F–AVR–09/09