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Pin name
CIRCUIT DESCRIPTION
Description
EQ IC (LC7522)
CLK signal input pin of EQ IC LC7522.
CLK
High when power is OFF.
P142
Nch
Output pin for the signal which makes the DATA or CLK signal output from P21 and
P20, so that the other IC does not input to the Vol. IC.
This signal ANDed with the signal from P21, P20 are input to the Switch IC.
High when power is OFF.
VOL IC
DATA MUTE
Muting signal during tuner scanning when the input selector is changed.
Normally low : Active high. High when power is OFF.
P140
N ch
( open
—30V ON/OFF control signal output pin to light the EQ/SPI display and other display
—30V
sections simultaneously.
ON/OFF
A high level signal is output about 500ms after the POWER
pin (P31) goes high.
Low when power is OFF.
Power supply pin.
33
P33
1/0
Serial
DATA pin for system serial communication.
(CMOS)
|
DATA
Normally in input mode, and in output mode only when serial data is output.
.
BUSY pin for system serial communication.
Serial
ene
;
:
:
.
34
Normally in input mode, Outputs a high level signal when serial data is output.
BUSY
.
«
;
Also provides the serial bus controj function.
Output pin for the power relay control : Active high.
35
POWER
This is controlied by the POWER
key. It alternates between high (Power ON) and low
(CMOS)
(Power OFF) each time the POWER
key is pressed.
P30
9G
P43
8G
P42
7G
P41
O
6G
FL digit control pin.
P40
(CMOS)
6G
Negative logic.
P53
4G
Drives the FL display through an inversion buffer.
P52
3G
P51
2G
P50
iG
|
Input pin for the reset signal from the microprocessor.
oe
oe
System clock oscillator pin (4.194MHz),
48
P63
Seg a, Key
49
P62
Seg b, Key
50
P61
Seg c, Key
51
P60
Seg d, Key
52
P73
Seg e, Key
53
P72
Seg f, Key
FL segment control pin.
54
P71
Seg g, Key
Negative logic.
55
P70
io)
Seg h, Key
Drives the FL display through an inversion buffer.
56
P83
(CMOS)
Seg i, Key
Key intake strobe signal output pin.
57
P82
Seg j
Intakes each key press one by one during the display blanking period.
58
P81
Seg k
59
P80
Seg |
60
P93
Seg m
61
PQ2
Seg n
62
P91
Seg o
63
P90
Seg p
:
64
Vss
GND pin.
21
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