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M38049FEHKP 数据表(PDF) 165 Page - Renesas Technology Corp |
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M38049FEHKP 数据表(HTML) 165 Page - Renesas Technology Corp |
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165 / 387 page ![]() 2-41 APPLICATION 2.3 Timer Rev.1.00 Jan 14, 2005 REJ09B0212-0100Z 3804 Group (Spec.H) (5) Timer application example 4: Measurement of FG pulse width for motor Outline: The timer Z counts the “H” level width of the pulses input to the P47/CNTR2 pin. An underflow is detected by the timer Z interrupt and an end of the input pulse “H” level is detected by the P47/CNTR2 interrupt. Specifications: •The timer Z counts the “H” level width of the FG pulse input to the P47/CNTR2 pin. <Example> When the clock frequency is 8 MHz, the count source is 2 µs, which is obtained by dividing the clock frequency by 16. Measurement can be made up to 131.072 ms in the range of FFFF16 to 000016. Figure 2.3.25 shows the timers connection and setting of division ratio; Figure 2.3.26 shows the relevant registers setting; Figure 2.3.27 and Figure 2.3.28 show the control procedure. Fig. 2.3.25 Timers connection and setting of division ratios 131.072 ms 1/161/65536 f(XIN) = 8 MHz Timer Z count source selection bit Timer Z Timer Z interrupt request bit 0 : No interrupt request issued 1 : Interrupt request issued 0 or 1 |
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