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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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M38045FFHKP датащи(PDF) 159 Page - Renesas Technology Corp |
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M38045FFHKP датащи(HTML) 159 Page - Renesas Technology Corp |
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159 / 387 page  2-35 APPLICATION 2.3 Timer Rev.1.00 Jan 14, 2005 REJ09B0212-0100Z 3804 Group (Spec.H) (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) = 8 MHz into about 2 kHz (2049 Hz), is output from the P47/CNTR2 pin. •The level of the P47/CNTR2 pin is fixed to “H” while a piezoelectric buzzer output stops. Figure 2.3.18 shows a peripheral circuit example, and Figure 2.3.19 shows the timers connection and setting of division ratios. Figure 2.3.20 shows the relevant registers setting, and Figure 2.3.21 shows the control procedure. Fig. 2.3.18 Peripheral circuit example Fig. 2.3.19 Timers connection and setting of division ratios 3804 Group (Spec. H) P47/CNTR2 PiPiPi..... 244 µs CNTR2 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 Z can be 244 µs. 1/161/122 CNTR2 f(XIN) = 8 MHz Timer Z count source selection bit Timer Z |
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