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Panel Microprocessor : UPD780021AGC-106-8BS (X25 : IC1)
Pin
Pin Name
I/O
Description / Processing Operation
1~4
KS0~KS3
O
Key scan signal output 0~3
5
VFD_BLK
O
VFD driver blank output
6~8
NC
O
Not used (OPEN)
9
VSS
GND
10
VDD
Positive power supply
11~14
NC
O
Not used (OPEN)
15
VFD_LAT
O
VFD SIO latch
16
VFD_DATA
O
VFD driver data output
17
VFD_CLK
O
VFD driver clock output
18
MC_DATA
I
System computer communication data input
19
SC_DATA
O
System computer communication data output
20
MC_CLK
I
System computer communication clock input
21
SC_BUSY
O
System computer panel BUSY output
22,23
NC
O
Not used (OPEN)
24
AVDD
Positive power supply
25
AVSS
GND
26
ENC_UP
I
Encoder input (UP)
27
ENC_DOWN
I
Encoder input (DOWN)
28~33
NC
I
Not used
34
AVREF
I
GND
35
AVDD
Not used
36
RESET
I
Reset input
“L” : Reset
37
XT2
Not used
38
XT1
I
Not used (GND)
39
IC/VPP
Not used
40
X2
Main clock (8.38MHz)
41
X1
I
Main clock (8.38MHz)
42
VSS1
GND
43
SC_CON
I
System computer communication and panel operation control input
44
MC_REQ
I
System computer communication and receive request input
45,46
KR1,KR0
I
Key return signal input 1,0
47
SC_REQ
O
Communication request to system computer
48~50
KR2~KR4
I
Key return signal input 2~4
51
VFD_ON
O
VDD1 control for VFD
Operat with system computer’s PON and PN_SC_CON, “H” : on
52~64
NC
O
Not used (OPEN)
MICROCOMPUTER’S TERMINAL DESCRIPTION
7
GX-401EF2
