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38K2 Datasheet(PDF) 185 Page - Renesas Technology Corp |
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38K2 Datasheet(HTML) 185 Page - Renesas Technology Corp |
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185 / 358 page  2.3 Timer Rev.2.00 Oct 15, 2006 page 36 of 112 38K2 Group REJ09B0338-0200 APPLICATION (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 P51/CNTR0 pin. An underflow is detected by the timer X interrupt and an end of the input pulse “H” level is detected by the CNTR0 interrupt. Specifications: •The timer X counts the “H” level width of the FG pulse input to the P51/CNTR0 pin. <Example> When the clock frequency is 6 MHz, the count source is 2.67 µs, which is obtained by dividing the clock frequency by 16. Measurement can be performed to 175 ms in the range of FFFF16 to 000016. Figure 2.3.20 shows the timers connection and setting of division ratio; Figure 2.3.21 shows the related registers setting; Figure 2.3.22 shows the control procedure. Fig. 2.3.20 Timers connection and setting of division ratios 175 ms 1/16 1/256 1/256 f(XIN) = 6 MHz Fixed Prescaler X Timer X Timer X interrupt request bit 0 : No interrupt request issued 1 : Interrupt request issued 0 or 1 |
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