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M38B53M4-059FP Datasheet(PDF) 116 Page - Mitsubishi Electric Semiconductor |
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M38B53M4-059FP Datasheet(HTML) 116 Page - Mitsubishi Electric Semiconductor |
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116 / 355 page  2-28 38B5 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 P61/CNTR0/CNTR2 pin. An underflow is detected by the timer X interrupt and an end of the input pulse “H” level is detected by the timer 2 interrupt of which count source is the input to P61/CNTR0/CNTR2 pin. Specifications: •The timer X counts the “H” level width of the FG pulse input to the P61/CNTR0/ CNTR2 pin. <Example> When f(XIN) = 4.19 MHz, the count source is 15.2 µs, which is obtained by dividing the clock frequency by 64. Measurement can be made up to 1 s in the range of FFFF16 to 000016. Figure 2.2.25 shows the timers connection and setting of division ratio; Figure 2.2.26 shows the relevant registers setting; Figure 2.2.27 shows the control procedure. Fig. 2.2.25 Timers connection and setting of division ratios f(XIN) = 4.19 MHz 1 second 1/641/65536 0/1 Timer X count source selection bit Timer XTimer X interrupt request bit |
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