102
EPSON
S1C63358 TECHNICAL MANUAL
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Buzzer Output Circuit)
4.13.3 Control of buzzer output
The buzzer signal frequency is selected by the buzzer frequency selection register BZFQ. When "1" is
written to the BZFQ register, the frequency is set to 2 kHz. When "0" is written, it is set to 4 kHz. This
signal is generated by dividing the f
OSC1
.
f
OSC1
2 kHz
4 kHz
32.768 kHz
f
OSC1
/16
f
OSC1
/8
The buzzer signal is output from the BZ terminal by writing "1" to the buzzer output control register
BZON.
When negative polarity is selected, the BZ terminal goes to a high (V
DD
) level by writing "0" to the BZON
register. When positive polarity is selected, the BZ terminal goes to a low (V
SS
) level by writing "0".
BZON register
Buzzer output (BZ)
Negative polarity
Buzzer output (BZ)
Positive polarity
"1"
"0"
"0"
Fig. 4.13.3.1 Timing chart of buzzer signal output
2 Hz intervals can be added to the buzzer signal when "1" is written to the ENON register.
BZON register
ENON register
Buzzer output
2 Hz
"1"
"0"
"0"
"1"
"0"
"0"
2 Hz
Fig. 4.13.3.2 2 Hz interval
Note: Since it generates a buzzer signal that is out of synchronization with the BZON register, hazards
may at times be produced when the signal goes ON/OFF due to the setting of the BZON register.
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