Description Of Lsi (Ic-1) - Sharp KB-3425LS Service Manual

KB-3425LS/K/W
KB-4425LS/K/W
The I/O signal of the LSIis detailed in the following table.
Pin No. Signal
 P96
2 P95
3 P94
4 P93
5 P92
6 P9
7 P90
8 BYTE
9 CNVSS
0 P87
 P86
2 RESET
3 XOUT
4 VSS
5 XIN
6 VCC
7 NMI
8 P84
9 P83

DESCRIPTION OF LSI (IC-1)

I/O
Signal coming from Transparent electrode (touch key on the LCD).
IN
When the  key of the transparent electrode is touched, a corresponding signal out of
OUT of IC-2 will be input into P96 of IC-.
IN Signal coming from Transparent electrode (touch key on the LCD).
When the 2 key of the transparent electrode is touched, a corresponding signal out of
OUT3 of IC-2 will be input into P95 of IC-.
Signal coming from Transparent electrode (touch key on the LCD).
IN
When the 3 key of the transparent electrode is touched, a corresponding signal out of
OUT4 of IC-2 will be input into P94 of IC-.
OUT The signal to adjust the contrast of LCD is output to IC-5.
Signal coming from Transparent electrode (touch key on the LCD).
IN
When the 4 key of the transparent electrode is touched, a corresponding signal out of
OUT of IC-3 will be input into P92.
IN Signal coming from Transparent electrode (touch key on the LCD).
When the 5 key of the transparent electrode is touched, a corresponding signal out of
OUT3 of IC-3 will be input into P9.
IN Signal coming from Transparent electrode (touch key on the LCD).
When the 6 key of the transparent electrode is touched, a corresponding signal out of
OUT4 of IC-3 will be input into P90.
IN Connected to VCC.
Power source voltage: 0V (GND).
IN
The power source vpltage to drive the LSI (IC-) is input. Connected to GND.
OUT Memory (EEPROM) clock out.
IN/OUT Memory (EEPROM) data input/output.
Auto clear terminal.
IN
Signal is input to reset the LSI to the initial state when power is applied. Temporarily set
to "L" level the moment power is applied, at this time the LSI is reset. Thereafter set at
"H" level.
Internal clock oscillation frequency control output.
OUT
Output to control oscillation input of Xin.
IN Power source voltage: 0V (GND).
The power source vpltage to drive the LSI (IC-) is input. Connected to GND.
Internal clock oscillation frequency setting input.
IN
The internal clock frequency is set by inserting the ceramic filter oscillation circuit with
respect to Xout terminal.
IN Power source voltage: +5.0V.
The power source voltage to drive the LSI (IC-) is input to VCC therminal.
IN Connected to VCC.
Input signal which communicates the drawer door close information to LSI from
IN
the door sensing switch.
Door opened; "L" level signal(0V).
Door closed; "H" level signal(+5V).
IN Input signal which communicates the drawer door open information to LSI from
the door position switch front.
Door opened; "L" level signal(0V).
Door closed; "H" level signal(+5V).
Description
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