M38005M2DXXXFP データシートの表示（PDF） - MITSUBISHI ELECTRIC

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M38005M2DXXXFP

8-BIT SINGLE-CHIP MICROCOMPUTER

MITSUBISHI ELECTRIC  

APPLICATION

2.2 Timer

(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.

CNTR0 output

The “H” level is output while a piezoelectric buzzer output is stopped.

3800 group

244 µs 244 µs

P54/CNTR0

PiPiPi....

Set a division ratio so that the underflow output cycle of the Timer X becomes this value.

Fig. 2.2.13 Example of a peripheral circuit

f(XIN) = 4.19 MHz

Fixed

1/16

Prescaler X

1

Timer X

1/64

Fixed

1/2

CNTR0

Fig. 2.2.14 Connection of the timer and setting of the division ratio [Piezoelectric buzzer output]

3800 GROUP USER’S MANUAL

2-15

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