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3850 Datasheet(PDF) 85 Page - Renesas Technology Corp

Part # 3850
Description  8-BIT SINGLE-CHIP MICROCOMPUTER
PDF  261 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

3850 Datasheet(HTML) 85 Page - Renesas Technology Corp

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2-16
3850/3851 Group User’s Manual
APPLICATION
2.2 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 P27/CNTR0 pin.
•The level of the P27/CNTR0 pin is fixed to “H” while a piezoelectric buzzer output
stops.
Figure 2.2.14 shows a peripheral circuit example, and Figure 2.2.15 shows the timers connection and
setting of division ratios. Figures 2.2.16 shows the relevant registers setting, and Figure 2.2.17
shows the control procedure.
3851 Group
P27/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.
Fig. 2.2.14 Peripheral circuit example
1/16
1/64
1/2
CNTR0
1
f(XIN) = 4.19 MHz
Timer X count source
selection bit
Prescaler X
Timer X
Fixed
Fig. 2.2.15 Timers connection and setting of division ratios



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