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H8/3021 Datasheet(PDF) 252 Page - Renesas Technology Corp |
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H8/3021 Datasheet(HTML) 252 Page - Renesas Technology Corp |
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252 / 712 page  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 register function Set period Start counter Free-running counting Start counter Periodic counter Free-running counter 1 2 3 4 55 Yes No 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. |
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