H8SLASH3021 datasheet(252/712 Pages) RENESAS

No. de pieza	H8/3021

Descripción Electrónicos	16-Bit Single-Chip Microcomputer

PDF	712 Pages

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Fabricante Electrónico	RENESAS [Renesas Technology Corp]

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8. 16-Bit Integrated Timer Unit (ITU)

Rev.2.00 Mar. 22, 2007 Page 228 of 684

REJ09B0352-0200

Counter setup

Select counter clock

Type of counting?

Periodic counting

Select counter clear source

Select output compare

Set period

Start counter

Free-running counting

Start counter

Periodic counter

Free-running counter

Yes

Figure 8.14 Counter Setup Procedure (Example)

1. Set bits TPSC2 to TPSC0 in TCR to select the counter clock source. If an external clock source

is selected, set bits CKEG1 and CKEG0 in TCR to select the desired edge(s) of the external

clock signal.

2. For periodic counting, set CCLR1 and CCLR0 in TCR to have TCNT cleared at GRA compare

match or GRB compare match.

3. Set TIOR to select the output compare function of GRA or GRB, whichever was selected in

step 2.

4. Write the count period in GRA or GRB, whichever was selected in step 2.

5. Set the STR bit to 1 in TSTR to start the timer counter.

H8/3021 Datasheet(PDF) 252 Page - Renesas Technology Corp