HD6433694 Datasheet, PDF (204/432 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Tiny Series

13.2.3 Timer Mode Register WD (TMWD)
TMWD selects the input clock.
Initial
Bit
Bit Name Value R/W Description
7 to 4 
All 1

Reserved
These bits are always read as 1.
3
CKS3
1
R/W Clock Select 3 to 0
2
CKS2
1
R/W Select the clock to be input to TCWD.
1
CKS1
1
R/W 1000: Internal clock: counts on φ/64
0
CKS0
1
R/W 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.
Rev. 4.00, 03/04, page 176 of 400