m3819 Renesas Electronics Corporation., m3819 Datasheet - Page 95

• Manufacturer Part Number: m3819
• Description: Mitsubishi 8-bit Single-chip Microcomputer 740 Family / 38000 Series
• Manufacturer: Renesas Electronics Corporation.

2. APPLICATION
Fig. 2.2.15 Example of a peripheral circuit
Fig. 2.2.16 Connection of the timer and setting of the division ratio [Piezoelectric buzzer output]
(3) Timer application example 2: Piezoelectric buzzer output
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.
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(X
244 s
244 s
• The level of the T3
f(X
4.19 MHz
from the T3
IN
The "H" level is output while a piezoelectric buzzer output is stopped.
) =
Set a division ratio so that the underflow output cycle of the Timer 3 becomes this value.
OUT
pin.
1/16
Fixed
OUT
3819 Group USER’S MANUAL
pin fixes to “H” while a piezoelectric buzzer output is stopped.
Timer 3
1/64
3819 group
Fixed
1/2
T3
OUT
T3
MITSUBISHI MICROCOMPUTER
OUT
IN
3819 Group
) = 4.19 MHz is output
2.2 Timer
PiPiPi....
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