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3886 Datasheet(PDF) 150 Page - Renesas Technology Corp |
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3886 Datasheet(HTML) 150 Page - Renesas Technology Corp |
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150 / 380 page  3886 Group User’s Manual APPLICATION 2-33 2.3 Timer (3) Timer application example 2: Piezoelectric buzzer output Outline: The rectangular waveform output function of the timer is applied for a piezoelectric buzzer output. Specifications: •The rectangular waveform, dividing the clock f(XIN) = 4.19 MHz (222 Hz) into about 2 kHz (2048 Hz), is output from the P54/CNTR0 pin. •The level of the P54/CNTR0 pin is fixed to “H” while a piezoelectric buzzer output stops. Figure 2.3.14 shows a peripheral circuit example, and Figure 2.3.15 shows the timers connection and setting of division ratios. Figures 2.3.16 shows the relevant registers setting, and Figure 2.3.17 shows the control procedure. Fig. 2.3.14 Peripheral circuit example Fig. 2.3.15 Timers connection and setting of division ratios 3886 Group P54/CNTR0 PiPiPi..... 244 µs CNTR0 output The “H” level is output while a piezoelectric buzzer output stops. 244 µs Set a division ratio so that the underflow output period of the timer X can be 244 µs. 1/16 1/64 1/2 CNTR0 1 f(XIN) = 4.19 MHz Fixed Prescaler X Timer X Fixed |
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