D12320VF25V Datasheet, PDF (377/1146 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 9 16-Bit Timer Pulse Unit (TPU)
9.4.2 Basic Functions
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 9.6 shows an example of the count operation setting procedure.
Operation selection
Select counter clock
[1]
Periodic counter
Select counter clearing source [2]
Select output compare register [3]
Set period
[4]
Start count
[5]
<Periodic counter>
Free-running counter
Start count
<Free-running counter>
[1] _{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.
[2] _{For periodic counter}
operation, select the
TGR to be used as
the TCNT clearing
source with bits
CCLR2 to CCLR0 in
TCR.
[3] _{Designate the TGR}
selected in [2] as an
output compare
register by means of
TIOR.
[4] _{Set the periodic}
counter cycle in the
TGR selected in [2].
[5] [5] _{Set the CST bit in}
TSTR to 1 to start
the counter
operation.
Figure 9.6 Example of Counter Operation Setting Procedure
Rev.7.00 Feb. 14, 2007 page 343 of 1108
REJ09B0089-0700