3069RF-ZTAT Datasheet, PDF (433/1003 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER

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. 5.0, 09/04, page 411 of 978