HD64F3028F25 Datasheet, PDF (441/925 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

Table 10.8 Internal Clock Switchover and 8TCNT Operation
CKS1 and CKS0 Write
No. Timing
1
High → high switchover^*1
8TCNT Operation
Old clock
source
New clock
source
8TCNT clock
8TCNT
2
High → low switchover^*2
Old clock
source
New clock
source
N
N+1
CKS bits rewritten
8TCNT clock
8TCNT
N
3
Low → high switchover^*3
Old clock
source
New clock
source
8TCNT clock
N+1
N+2
CKS bits rewritten
*4
8TCNT
N
N+1
N+2
CKS bits rewritten
Rev. 2.00, 09/03, page 409 of 890