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7641 Datasheet(PDF) 158 Page - Renesas Technology Corp |
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7641 Datasheet(HTML) 158 Page - Renesas Technology Corp |
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158 / 385 page  Rev.2.00 Aug 28, 2006 page 27 of 148 7641 Group REJ09B0336-0200 APPLICATION 2.2 Timer (4) Timer application example 3: Frequency measurement Outline: The pulse frequency input to P44/CNTR1 pin is measured by measuring the event number within a fixed term. Specifications: •The pulse is input to the P44/CNTR1 pin and counted by the timer Y. •A count value of timer Y is read out at 1 ms intervals, which is the timer 2 interrupt interval. As the result, the frequency can be calculated. (This example is in f(XIN) = 24 MHz and φ = f(XIN)/4.) •The input event number must be “FFFF16” within 1 ms. Figure 2.2.19 shows how to measure the frequency; Figure 2.2.20 shows the related registers setting; Figure 2.2.21 shows the control procedure. Fig. 2.2.19 How to measure frequency kHz Timer 2 interrupt request bit Input pulse X times Start of timer Y count Stop of timer Y count Note: Frequency = X times 1 ms ..... |
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