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7630 Datasheet(PDF) 92 Page - Renesas Technology Corp |
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7630 Datasheet(HTML) 92 Page - Renesas Technology Corp |
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92 / 238 page  2-26 7630 Group User’s Manual APPLICATION 2.3 Timers (3) Timer application example 2 : Measurement of frequency Outline : To judge if the frequency is within a given range, the following two values are compared • Timer value (representing the number of pulses at P14/CNTR0), • Referance value. Specifications : • The pulse is input to the P14/CNTR0 pin and counted by the Timer X. • A count value is read out at the interval of about 2 ms (Timer Y interrupt interval). When the count value is between 28 and 40, the input signal is judged valid. • Because the timer is a down-counter, the count value is compared with 227 to 215V. V 227 to 215 = 255 (initialized value of counter) – 28 to 40 (the number of valid value) Figure 2.3.11 shows a method for judging if input pulse exists, and Figure 2.3.12 and Figure 2.3.13 show a setting of related registers. Fig. 2.3.11 A method for judging if input pulse exists Input pulse More than 71.4 µs (Less than 14 kHz) Less than 50 µs (More than 20 kHz) 71.4 µs (14 kHz) 50 µs (20 kHz) Invalid Valid Invalid 2 ms 71.4 µs = 28 counts 2 ms 50 µs = 40 counts |
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