H8SSLASH2224 datasheet(484/1071 Pages) RENESAS

484 / 1071 page

Section 11 16-Bit Timer Pulse Unit (TPU)

Rev. 5.00 Aug 08, 2006 page 398 of 982

REJ09B0054-0500

11.4

Operation

11.4.1

Basic Functions

Each channel has a TCNT and TGR register. TCNT performs up-counting, and is also capable of

free-running operation, periodic counting, and external event counting.

Each TGR can be used as an input capture register or output compare register.

Counter Operation: When one of bits CST2 to CST0 (H8S/2227 Group) or bits CST5 to CST0

(groups other than H8S/2227) in TSTR is set to 1, the TCNT counter for the corresponding

channel starts counting. TCNT can operate as a free-running counter, periodic counter, and so on.

1. Example of count operation setting procedure

Figure 11.3 shows an example of the count operation setting procedure.

Select counter clock

Operation selection

Select counter clearing source

Periodic counter

Set period

Start count

[1]

[2]

[4]

[3]

[5]

Free-running counter

Start count

<Free-running counter>

[5]

[1]

[2]

[3]

[4]

[5]

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

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

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.

Figure 11.3 Example of Counter Operation Setting Procedure

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