E0C6001 TECHNICAL HARDWARE
I-30
Special output port data (0F3H D0, 0F3H D1)
Controls the buzzer output.
When 1 is written: Buzzer output
When 0 is written: Low level (DC) output
Reading:
Valid
BUZZER and BUZZER output can be controlled by writing
data to R00 and R01.
When BUZZER output by R01 register control is selected by
mask option, BUZZER output and BUZZER output can be
controlled simultaneously by writing data to R01 register.
After an initial reset, these registers are set to 0.
Figure 4.4.4 shows the output waveform for buzzer output.
R00, R01 (when BUZZER
and BUZZER is
selected)
Fig. 4.4.4
Buzzer output waveform
Buzzer frequency control (0FDH D3)
Selects the frequency of the buzzer signal.
When 1 is written: 2 kHz
When 0 is written: 4 kHz
Reading:
Valid
When R00 and R01 port is set to buzzer output, the fre-
quency of the buzzer signal can be selected by this register.
When 1 is written to this register, the frequency is set in 2
kHz, and in 4 kHz when 0 is written.
After an initial reset, this register is set to 0.
XBZR
R01 (R00) register
BUZZER output
waveform
0
1
BUZZER output
waveform
Содержание E0C6001
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