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Bit
Bit Name
4
3
RST/NMI
2
CKS2
1
CKS1
0
CKS0
Note:
*
Only 0 can be written, to clear the flag.
Initial
Value
R/W
Description
0
R/(W)
Reserved
The initial value should not be changed.
0
R/W
Reset or NMI
Selects to request an internal reset or an NMI interrupt
when TCNT has overflowed.
0: An NMI interrupt is requested
1: An internal reset is requested
0
R/W
Clock Select 2 to 0
0
R/W
Selects the clock source to be input to TCNT. The
overflow frequency for φ = 20 MHz is enclosed in
0
R/W
parentheses.
000: φ/2 (frequency: 25.6 µs)
001: φ/64 (frequency: 819.2 µs)
010: φ/128 (frequency: 1.6 ms)
011: φ/512 (frequency: 6.6 ms)
100: φ/2048 (frequency: 26.2 ms)
101: φ/8192 (frequency: 104.9 ms)
110: φ/32768 (frequency: 419.4 ms)
111: φ/131072 (frequency: 1.68 s)
Section 13 Watchdog Timer (WDT)
Rev. 1.00 May 09, 2008 Page 353 of 954
REJ09B0462-0100
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