HD6432646 Hitachi, HD6432646 Datasheet - Page 373

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HD6432646

Manufacturer Part Number
HD6432646
Description
(HD64F264x Series) 16-Bit Microcomputer
Manufacturer
Hitachi
Datasheet

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10.4.2
Counter Operation: When one of bits CST0 to CST5 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 10-6 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 10-6 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 counter
operation.
339

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