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7630 Datasheet(PDF) 89 Page - Renesas Technology Corp |
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7630 Datasheet(HTML) 89 Page - Renesas Technology Corp |
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89 / 238 page  APPLICATION 2.3 Timers 2-23 7630 Group User’s Manual (2) Timer application example 1 : Clock function (measurement of 25 ms) Outline : The input clock is divided by a timer so that the clock counts up every 25 ms. Specifications : • The clock f(XIN) = 8 MHz is divided by a timer. • The clock is counted at intervals of 25 ms by the Timer 3 interrupt. Figure 2.3.8 shows the timers connection and division ratios, Figures 2.3.9 show a setting of related registers, and Figure 2.3.10 shows a control procedure. Fig. 2.3.8 Timers connection and division ratios [Clock function] 1/2 Pre-divider (Note 2) Timer 1 Timer 3 25 ms The clock is divided by 40 by software. 1 second f(XIN) = 8 MHz 1/8 1/250 1/50 1/40 φ (Note 1) Note 1: The internal system clock φ is divided f(XIN) by 2 or by 8. The division ratio is decided by the Internal system clock selection bit (bit 6 of the CPU mode register [address: 000016] ). Note 2: The division ratio is decided by the Pre-divider division ratio bits (bit 6 and bit 7 of the Timer 123 mode register [address: 001916] ). Timer 3 interrupt request |
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