H8SSLASH2218 datasheet(349/750 Pages) RENESAS

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Section 9 16-Bit Timer Pulse Unit (TPU)

Rev.6.00 Jun. 03, 2008 Page 301 of 698

REJ09B0074-0600

9.5

Operation

9.5.1

Basic Functions

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

running operation, synchronous 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 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.

1. Example of count operation setting procedure

Figure 9.6 shows an example of the count operation setting procedure.

Operation selection

Select counter clock

Periodic counter

Select counter clearing source

Select output compare register

Set period

Free-running counter

Start count operation

<Free-running counter>

Start count operation

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.

[1]

[2]

[3]

[4]

[5]

Figure 9.6 Example of Counter Operation Setting Procedure

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