H8SSLASH2214 datasheet(452/936 Pages) RENESAS

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Section 10 16-Bit Timer Pulse Unit (TPU)

Rev.4.00 Sep. 18, 2008 Page 392 of 872

REJ09B0189-0400

This can be used for two-phase encoder pulse input.

10.4.2

Basic Functions

(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.

• Example of count operation setting procedure

Figure 10.6 shows an example of the count operation setting procedure.

Select counter clock

Operation selection

Select counter clearing source

Periodic counter

Set period

Start count operation

[1]

[2]

[4]

[3]

[5]

Free-running counter

Start count operation

<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 10.6 Example of Counter Operation Setting Procedure

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