SH7721 datasheet(591/1524 Pages) RENESAS

591 / 1524 page

Section 15

16-Bit Timer Pulse Unit (TPU)

Rev. 3.00 Jan. 18, 2008 Page 529 of 1458

REJ09B0033-0300

15.4.2

Basic Functions

(1)

Counter Operation

When one of bits CST0 to CST3 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 15.2 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]

[6]

Free-running counter

Start count

<Free-running counter>

[6]

Set external pin function

[5]

[1]

[2]

[3]

[4]

[5]

[6]

Select output compare register

Set external pin function

[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 TGRA

to be used as the TCNT

clearing source with bits

CCLR2 to CCLR0 in TCR.

Designate the output compare

Set the periodic counter cycle

in the TGRA.

Set the external pin function

in pin function controller (PFC).

Set the CST bit in TSTR to 1

to start the counter operation.

Figure 15.2

Example of Counter Operation Setting Procedure

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