HD64F3048VTF8 Datasheet, PDF (222/903 Pages) Renesas Technology Corp – Hardware Manual Renesas 8-Bit Single-Chip

Section 7 Refresh Controller
Table 7.9 Internal Clock Switchover and RTCNT Operation
CKS2 to CKS0
No. Write Timing
RTCNT Operation
1 Low → low switchover^*1
Old clock
source
New clock
source
RTCNT
clock
RTCNT
2 Low → high switchover^*2
Old clock
source
New clock
source
RTCNT
clock
N
N+1
CKS bits rewritten
RTCNT
N
N+1
N+2
CKS bits rewritten
Rev. 3.00 Sep 27, 2006 page 194 of 872
REJ09B0325-0300