3069RF-ZTAT Datasheet, PDF (205/1003 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER

No.
CKS2 to CKS0
Write Timing
3
High Low
switchover*³
Old clock source
RTCNT Operation
New clock source
*⁴
RTCNT clock
RTCNT
N
N+1
N+2
4
High High
switchover*⁴
Old clock source
CKS bits rewritten
New clock source
RTCNT clock
RTCNT
N
N+1
N+2
CKS bits rewritten
Notes:
1. Including switchovers from a low clock source to the halted state, and from the halted state to a low clock source.
2. Including switchover from the halted state to a high clock source.
3. Including switchover from a high clock source to the halted state.
4. The switchover is regarded as a falling edge, causing RTCNT to increment.
Rev. 5.0, 09/04, page 183 of 978