Sony SEQ-555ES - Page 15

As can be seen from the diagram, the LCD does not
light up while the C voltage is being applied.
When 1/2E voltage is applied, it lights up, but only
when E and —E voltage are applied, and goes off
SEQ-555ES
SEQ-555ES
A signal which indicates that data may be sent is
output from microcomputer B to pin@®. Data is
transmitted after this signal is received.
Pins @, @, @ ~ @ output key scan signals.
1C4s, (MICROCOMPUTER C)
This microcomputer controls LED display. It receives
data to be displayed from microcomputer B, and
controls which LED is to be lit up according to that
data.
Pins @ ~@ receive key inputs.
Pin @ is for remote control input, and is low
1C75,
(MICROCOMPUTER
A)
because
Qs27
is
ON.
This judges which key has been pressed for key input When the remote control signal is received at IC4o1, After data is completely received, microcomputer C
or remote control input, and transmits the data to Q152 goes off momentarily, so pin @) goes high and informs microcomputer B of this by a signal.
ICs9; microcomputer B). stops the key scan signal. Then the remote control Pins O~@:
Pin @ is a data output pin, and data is sent serially. signal passes Q752 buffer and is received.
when 1/3E voltage is applied. Before data is sent out, microcomputer B sends
an interrupt signal to microcomputer C.
Next the data is transmitted.
Input pins for data from micro-
computer B.
Pin
@
is
for
the
transmission
clock
signal,
and
ICso1
Pin
©
Interupt
signal
input
pin.
(microcomputer
B)
reads
in
data
at
the
rise
of
this
Pin
©
:
Reset
signal
input
pin.
clock
signal.
Pin
@
:
Outputs
signal
which
informs
that
When
data
is
transmitted,
a
sign
that
data
is
to
be
sent
iatas
has
hesnceeeived:
to
ICs9;
(microcomputer
B)
is
required,
and
this
is
Pin
@
Clock
signal
input
pin.
output by pin @.
. [(A) MICRO COMPUTER BOARD] 1c751 iit
A MICRO COMPUTER
os
Others pins (except power supply and ground) are
data output pins.
TO ANALOG 0an0 (3)
[(C) MICRO COMPUTER BOARD] —
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