Control Of Buzzer Output - Epson S1C6P366 Technical Manual

CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Buzzer Output Circuit)

4.12.3 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
f
OSC1
32.768 kHz
The buzzer signal is output from the BZ terminal by writing "1" to the buzzer output control register
BZON. The BZ terminal goes to a high (V
2 Hz intervals can be added to the buzzer signal when "1" is written to the ENON register.
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.
90
.
OSC1
2 kHz 4 kHz
f /16 f
OSC1 OSC1
) level by writing "0".
DD
BZON register "0"
Buzzer output (BZ)
Fig. 4.12.3.1 Timing chart of buzzer signal output
BZON register "0"
ENON register
Buzzer output
2 Hz
Fig. 4.12.3.2 2 Hz interval
/8
"1"
"1"
"0" "1"
2 Hz
EPSON
"0"
"0"
"0"
S1C6P366 TECHNICAL MANUAL