HD6417615 Hitachi Semiconductor, HD6417615 Datasheet - Page 683

• Manufacturer Part Number: HD6417615
• Description: Hardware Manual
• Manufacturer: Hitachi Semiconductor

16.4.2
Counter Operation: When one of bits CST0 to CST2 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 16.6 shows an example of the count operation setting procedure.
Select output compare register
Select counter clearing source
Start count operation
Select counter clock
Operation selection
<Periodic counter>
Basic Functions
Periodic counter
Set period
Figure 16.6 Example of Counter Operation Setting Procedure
1
2
3
4
5
<Free-running counter>
Free-running counter
Start count operation
5
1
2
3
4
5
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 TGR to be used
as the TCNT
clearing source with
bits CCLR2 to
CCLR0 in TCR.
Designate the TGR
selected in [2] as an
output compare
register by means
of TIOR.
Set the periodic
counter cycle in the
TGR selected in (2).
Set the CST bit in
TSTR to 1 to start
the count operation.
671