Datasheet

Section 13 Watchdog Timer
Rev.5.00 Nov. 02, 2005 Page 186 of 418
REJ09B0028-0500
13.2.3 Timer Mode Register WD (TMWD)
TMWD selects the input clock.
Bit Bit Name
Initial
Value R/W Description
7 to 4  All 1  Reserved
These bits are always read as 1.
3
2
1
0
CKS3
CKS2
CKS1
CKS0
1
1
1
1
R/W
R/W
R/W
R/W
Clock Select 3 to 0
Select the clock to be input to TCWD.
1000: Internal clock: counts on φ/64
1001: Internal clock: counts on φ/128
1010: Internal clock: counts on φ/256
1011: Internal clock: counts on φ/512
1100: Internal clock: counts on φ/1024
1101: Internal clock: counts on φ/2048
1110: Internal clock: counts on φ/4096
1111: Internal clock: counts on φ8192
0XXX: Internal oscillator
For the internal oscillator overflow periods, see section
21, Electrical Characteristics.
Legend: X: Don't care.