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3802_M Datasheet(PDF) 73 Page - Renesas Technology Corp

Part # 3802_M
Description  8-BIT SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 38000 SERIES
PDF  208 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

3802_M Datasheet(HTML) 73 Page - Renesas Technology Corp

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APPLICATION
2.2 Timer
2-15
3802 GROUP USER’S MANUAL
(3) Timer application example 2 : Piezoelectric buzzer output
Outline : The rectangular waveform output function of a timer is applied for a piezoelectric buzzer
output.
Specifications : • The rectangular waveform resulting from dividing clock f(XIN) = 4.19 MHz into about
2 kHz (2048 Hz) is output from the P54/CNTR0 pin.
• The level of the P54/CNTR0 pin fixes to “H” while a piezoelectric buzzer output is
stopped.
Figure 2.2.13 shows an example of a peripheral circuit, and Figure 2.2.14 shows a connection of the
timer and setting of the division ratio.
Fig. 2.2.13 Example of a peripheral circuit
Fig. 2.2.14 Connection of the timer and setting of the division ratio [Piezoelectric buzzer output]
244 µ s
244 µ s
3802 group
PiPiPi....
P54/CNTR0
Set a division ratio so that the underflow output cycle of the Timer X becomes this value.
The “H” level is output while a piezoelectric buzzer output is stopped.
CNTR0 output
1/16
1/2
f(XIN) = 4.19 MHz
Fixed
Timer X
Fixed
1/64
CNTR0
1
Prescaler X



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