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Note: When an interrupt is generated, clear the source flag in the interrupt handler. If the interrupt
enabled state is set without clearing the flag, another interrupt will be generated.
Figure 12.2 Example of Count Operation Setting Procedure
Auto-Reload Count Operation: Figure 12.3 shows the TCNT auto-reload operation.
TCNT value
TCOR
H'00000000
STR0–STR2
UNF
Rev. 4.0, 04/00, page 252 of 850
Operation selection
Select count clock
Underflow interrupt
generation setting
Input capture interrupt
Timer constant
register setting
Set initial timer
counter value
Start count
Figure 12.3 TCNT Auto-Reload Operation
1
2
When input capture
function is used
generation setting
4
5
6
TCOR value set in TCNT
on underflow
3
Time
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