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7540 Datasheet(PDF) 124 Page - Renesas Technology Corp |
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7540 Datasheet(HTML) 124 Page - Renesas Technology Corp |
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124 / 366 page  2-48 REJ09B0018-0200Z Rev.2.00 Jun 21, 2004 APPLICATION 7540 Group 2.4 Timer X (3) Application example of timer mode Outline: The input clock is divided by the timer so that the clock is counted up every 250 ms intervals. Specifications: •The f(XIN) = 4.19 MHz (222 Hz) is divided by timer X. •The clock is counted up in the timer X interrupt processing routine (timer X interrupt occurs every 250 ms). • Operation clock: f(XIN) = 4.19 MHz, high-speed mode Figure 2.4.11 shows the connection of timer and setting of division ratio and Figure 2.4.12 shows an example of control procedure. Fig. 2.4.11 Connection of timer and setting of division ratio f(XIN) = 4.19 MHz Prescaler XTimer X Timer X interrupt request bit 250 ms 1/16 1/256 1/256 0 or 1 1/4 1s Divided by 4 by software 0: No interrupt request 1: Interrupt request Timer X count source selection bits |
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