571
WDT1 Input Clock Select
Description
Bit 4
PSS
Bit 2
CKS2
Bit 1
CKS1
Bit 0
CKS0
Clock
Overflow Period
*
(where ø = 25 MHz)
(where ø SUB = 32.768 kHz)
0
0
0
0
ø/2 (initial value)
20.4 µs
1
ø/64
652.8 µs
1
0
ø/128
1.3 ms
1
ø/512
5.2 ms
1
0
0
ø/2048
20.9 ms
1
ø/8192
83.6 ms
1
0
ø/32768
334.2 ms
1
ø/131072
1.34 s
1
0
0
0
øSUB/2
15.6 ms
1
øSUB/4
31.3 ms
1
0
øSUB/8
62.5 ms
1
øSUB/16
125 ms
1
0
0
øSUB/32
250 ms
1
øSUB/64
500 ms
1
0
øSUB/128
1 s
1
øSUB/256
2 s
Note:
*
An overflow period is the time interval between the start of counting up from H'00 on the
TCNT and the occurrence of a TCNT overflow.