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Section 10 8-Bit Timers
No.
CKS1 and CKS0 Write Timing
Low → low switchover
4
Notes: 1. Including switchovers from a high clock source to the halted state, and from the halted
state to a high clock source.
2. Including switchover from the halted state to a low clock source.
3. Including switchover from a low clock source to the halted state.
4. The switchover is regarded as a rising edge, causing TCNT to increment.
Rev. 4.00 Jan 26, 2006 page 434 of 938
REJ09B0276-0400
TCNT Operation
Old clock source
New clock source
TCNT clock
TCNT
N
N+1
N+2
CKS bits rewritten
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