Datasheet

Section 10 8-Bit Timers
Rev.7.00 Feb. 14, 2007 page 412 of 1108
REJ09B0089-0700
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