Operation selection
Select count clock
1
2
Underflow interrupt
generation setting
When input capture
function is used
Input capture interrupt
generation setting
3
Timer constant
register setting
4
Set initial timer
counter value
5
6
Start count
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 value set in TCNT
on underflow
TCOR
H'00000000
STR0–STR2
Time
UNF
Figure 12.3 TCNT Auto-Reload Operation
Rev. 6.0, 07/02, page 305 of 986
RENESAS [ RENESAS TECHNOLOGY CORP ]
