ATmega8U2/16U2/32U2
Table 10-8. Watchdog Timer Prescale Select, DIV = 5 (CLKwdt = CLK128 / 11)
Watchdog
Reset/Interrupt Typical
Time-out at
Number of WDT Oscillator
Cycles before 1st time-out
(Early warning)
Early warning Typical
Time-out at
WDP3
WDP2
WDP1
WDP0
VCC = 5.0V
V
CC = 5.0V
176 ms
352 ms
704 ms
1.4 s
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
2K (2048) cycles
4K (4096) cycles
88 ms
176 ms
352 ms
704 ms
1.4 s
8K (8192) cycles
16K (16384) cycles
32K (32768) cycles
64K (65536) cycles
128K (131072) cycles
256K (262144) cycles
512K (524288) cycles
1024K (1048576) cycles
2.8 s
2.8 s
5.6 s
5.6 s
11.2 s
22.5 s
45 s
11.2 s
22.5 s
45s
90 s
Reserved
Table 10-9. Watchdog Timer Prescale Select, DIV = 6(CLKwdt = CLK128 / 13)
Watchdog
Reset/Interrupt Typical
Time-out at
Number of WDT Oscillator
Cycles before 1st time-out
(Early warning)
Early warning Typical
Time-out at
WDP3
WDP2
WDP1
WDP0
V
CC = 5.0V
104 ms
208 ms
416 ms
832 ms
1.6 s
V
CC = 5.0V
208 ms
416 ms
832 ms
1.64 s
3.3 s
0
0
0
0
0
0
0
0
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
0
0
1
1
0
0
0
1
0
1
0
1
0
1
0
1
2K (2048) cycles
4K (4096) cycles
8K (8192) cycles
16K (16384) cycles
32K (32768) cycles
64K (65536) cycles
128K (131072) cycles
256K (262144) cycles
512K (524288) cycles
1024K (1048576) cycles
3.3 s
6.6 s
6.6 s
13.3 s
26.6 s
53.2 s
106.4 s
13.3 s
26.6 s
53.2 s
62
7799D–AVR–11/10
ATMEL [ ATMEL ]
