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Table 11.5 Switching of Internal Clock and TCNT Operation
Timing to Change CKS1
No.
and CKS0 Bits
1
Switching from low to low*
2
Switching from low to high*
3
Switching from high to low*
4
Switching from high to high
Notes: 1. Includes switching from low to stop, and from stop to low.
2. Includes switching from stop to high.
3. Includes switching from high to stop.
4. Generated because the change of the signal levels is considered as a falling edge;
TCNT is incremented.
TCNT Clock Operation
1
Clock before
switchover
Clock after
switchover
TCNT input
clock
TCNT
2
Clock before
switchover
Clock after
switchover
TCNT input
clock
TCNT
3
Clock before
switchover
Clock after
switchover
TCNT input
clock
TCNT
Clock before
switchover
Clock after
switchover
TCNT input
clock
TCNT
Section 11 8-Bit Timers (TMR)
N
N + 1
CKS bits changed
N
N + 1
CKS bits changed
4
*
N
N + 1
N + 2
CKS bits changed
N
N + 1
CKS bits changed
Rev.2.00 Jun. 28, 2007 Page 435 of 666
N + 2
N + 2
REJ09B0311-0200
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