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3850 Datasheet(PDF) 91 Page - Renesas Technology Corp |
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3850 Datasheet(HTML) 91 Page - Renesas Technology Corp |
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91 / 261 page  2-22 3850/3851 Group User’s Manual 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 P27/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 P27/CNTR0 pin. <Example> When the clock frequency is 4.19 MHz, the count source is 3.8 µs, which is obtained by dividing the clock frequency by 16. Measurement can be made up to 250 ms in the range of FFFF16 to 000016. Figure 2.2.21 shows the timers connection and setting of division ratio; Figure 2.2.22 shows the relevant registers setting; Figure 2.2.23 shows the control procedure. Fig. 2.2.21 Timers connection and setting of division ratios 250 ms 1/16 1/256 1/256 f(XIN) = 4.19 MHz Timer X count source selection bit 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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