Rev. 2.00, 09/03, page 343 of 690
14.4.2
Basic Functions
Counter Operation: When one of bits CST0 to CST3 is set to 1 in TSTR, the TCNT counter for
the corresponding channel starts counting. TCNT can operate as a free-running counter, periodic
counter, and so on.
•
Example of count operation setting procedure
Figure 14.2 shows an example of the count operation setting procedure.
Select counter clock
Operation selection
Select counter clearing source
Periodic counter
Set period
Start count
<Periodic counter>
[1]
[2]
[4]
[3]
[6]
Free-running counter
Start count
<Free-running counter>
[6]
Set external pin function
[5]
[1]
[2]
[3]
[4]
[5]
[6]
Select output compare register
Select the counter clock
with bits TPSC2 to
TPSC0 in TCR. At the
same time, select the
input clock edge with bits
CKEG1 and CKEG0 in
TCR.
For periodic counter
operation, select the
TGRA to be used as the
TCNT clearing source
with bits CCLR2 to
CCLR0 in TCR.
Designate the output
compare register by
means of TIOR.
Set the periodic counter
cycle in the TGRA.
Set the external pin
function in pin function
controller (PFC).
Set the CST bit in TSTR
to 1 to start the count
operation.
Set external pin function
[5]
Figure 14.2 Example of Counter Operation Setting Procedure
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