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3819 Datasheet(PDF) 95 Page - Renesas Technology Corp

Part # 3819
Description  8-BIT SINGLE-CHIP MICROCOMPUTER
PDF  218 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

3819 Datasheet(HTML) 95 Page - Renesas Technology Corp

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81
2. APPLICATION
MITSUBISHI MICROCOMPUTER
3819 Group
2.2 Timer
3819 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, 2 kHz (2048 Hz) which is divided clock f(XIN) = 4.19 MHz is output
from the T3OUT pin.
• The level of the T3OUT pin fixes to “H” while a piezoelectric buzzer output is stopped.
Figure 2.2.15 shows an example of a peripheral circuit, and Figure 2.2.16 shows a connection of the timer and setting
of the division ratio.
Fig. 2.2.16 Connection of the timer and setting of the division ratio [Piezoelectric buzzer output]
Fig. 2.2.15 Example of a peripheral circuit
1/16
1/2
f(XIN) =
4.19 MHz
Fixed
Timer 3
Fixed
1/64
T3OUT
244
µs
244
µs
3819 group
PiPiPi....
T3OUT
Set a division ratio so that the underflow output cycle of the Timer 3 becomes this value.
The "H" level is output while a piezoelectric buzzer output is stopped.



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