H8SXSLASH1663 datasheet(589/1158 Pages) RENESAS

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Section 10 16-Bit Timer Pulse Unit (TPU)

Rev.1.00 Jun. 07, 2006 Page 537 of 1102

REJ09B0294-0100

10.4

Operation

10.4.1

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.

(1) 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.

(a) Example of count operation setting procedure

Figure 10.2 shows an example of the count operation setting procedure.

Select counter clock

Operation selection

Select counter clearing source

Periodic counter

Set period

Start count

[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

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 10.2 Example of Counter Operation Setting Procedure

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