Renesas H8S/2318 series, Hardware Manual

Page: 434 / 1121

Rev. 5.00, 12/03, page 404 of 1088
Table 10-5 Switching of Internal Clock and TCNT Operation
No.
Timing of Switchover
by Means of CKS1
and CKS0 Bits
TCNT Clock Operation
1 Switching from
low to low
*
1
Clock before
switchover
Clock after
switchover
TCNT clock
TCNT
CKS bit write
N N+1
2 Switching from
low to high
*
2
Clock before
switchover
Clock after
switchover
TCNT clock
TCNT
CKS bit write
N N+1 N+2
3 Switching from
high to low
*
3
Clock before
switchover
Clock after
switchover
TCNT clock
TCNT
CKS bit write
N N+1 N+2
*
4