HD6433044 Datasheet, PDF (196/867 Pages) Hitachi Semiconductor – Hitachi Single-Chip Microcomputer

Table 7-9 Internal Clock Switchover and RTCNT Operation (cont)
CKS2 to CKS0
No. Write Timing
RTCNT Operation
3 High → low switchover^*1
Old clock
source
New clock
source
RTCNT
*2
clock
RTCNT
N
4 High → high switchover
Old clock
source
New clock
source
RTCNT
clock
N+1
N+2
CKS bits rewritten
RTCNT
N
N+1
N+2
CKS bits rewritten
Notes: 1. Including switchover from a high clock source to the halted state.
2. The switchover is regarded as a falling edge, causing RTCNT to increment.
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