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7641 Datasheet(PDF) 161 Page - Renesas Technology Corp |
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7641 Datasheet(HTML) 161 Page - Renesas Technology Corp |
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161 / 385 page  Rev.2.00 Aug 28, 2006 page 30 of 148 7641 Group REJ09B0336-0200 APPLICATION 2.2 Timer (5) Timer application example 4: Measurement of FG pulse width for motor Outline: The timer X counts the “H” level width of the pulses input to the P43/CNTR0 pin. Specifications: •The timer X counts the “H” level width of the FG pulse input to the P43/CNTR0. <Example> When f(XIN) = 24 MHz and φ = 6 MHz, the count source is 10.6 µs, which is obtained by dividing the φ by 64. Measurement can be made up to 1 s in the range of FFFF16 to 000016. Figure 2.2.22 shows the timers connection and setting of division ratio; Figure 2.2.23 shows the related registers setting; Figures 2.2.24 and 2.2.25 show the control procedure. Fig. 2.2.22 Timers connection and setting of division ratios f(XIN) = 24.0 MHz 700 ms 1/64 1/65536 0/1 1/2 CCR7 1/2 Timer X count source selection φ / 64 Timer X Timer X interrupt request bit |
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