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M38B53M4-059FP Datasheet(PDF) 111 Page - Mitsubishi Electric Semiconductor

Part # M38B53M4-059FP
Description  8-BIT SINGLE-CHIP MICROCOMPUTER
PDF  355 Pages
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Manufacturer  MITSUBISHI [Mitsubishi Electric Semiconductor]
Direct Link  http://www.mitsubishichips.com
Logo MITSUBISHI - Mitsubishi Electric Semiconductor

M38B53M4-059FP Datasheet(HTML) 111 Page - Mitsubishi Electric Semiconductor

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38B5 Group User’s Manual
APPLICATION
2-23
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 P46/T3OUT pin.
•The level of the P46/T3OUT pin is fixed to “H” while a piezoelectric buzzer output
stops.
Figure 2.2.18 shows a peripheral circuit example, and Figure 2.2.19 shows the timers connection and
setting of division ratios. Figures 2.2.20 shows the relevant registers setting, and Figure 2.2.21
shows the control procedure.
Fig. 2.2.18 Peripheral circuit example
Fig. 2.2.19 Timers connection and setting of division ratios
38B5 Group
T3OUT
PiPiPi.....
244
µs
T3OUT 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 3 can be 244
µs.
f(XIN)
4.19 MHz
1/161/64
1/2
T3OUT
Timer 3Fixed



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