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SH7021 Datasheet(PDF) 262 Page - Renesas Technology Corp |
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SH7021 Datasheet(HTML) 262 Page - Renesas Technology Corp |
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262 / 509 page  246 RENESAS • Procedure for selecting counting mode (figure 10.14): 1. Set bits TPSC2–TPSC0 in the TCR to select the counter clock source. If an external clock source is selected, set bits CKEG1 and CKEG0 in the TCR to select the desired edges of the external clock signal. 2. To operate as a periodic counter, set CCLR1 and CCLR0 in the TCR to select whether to clear the TCNT at GRA compare match or GRB compare match. 3. Set the GRA or GRB selected in step 2 as an output compare register using the timer I/O control register (TIOR). 4. Write the desired cycle value in the GRA or GRB selected in step 1. 5. Set the STR bit in the TSTR to 1 to start counting. Counting mode selection Select counter clock Periodic counter Select counter clear source Select output compare register Set period Start counting Start counting Counting? No Yes Free-running counter Periodic counter Free-running counter (5) (5) (4) (3) (2) (1) Figure 10.14 Procedure for Selecting the Counting Mode |
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