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UD-300
CIRCUIT DESCRIPTION
GE microprocessor : M50940-345SP
Pin connection
Vss(Vp)
Vcc AVcc
35
|—»
A13
36
|—»
A12
37
|» Alt 38
|» A10 39
|-» AQ
60]*~
PEAK
—*- TEST
62|/"~—
CLK 63/*—
DI
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TLS
2
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Pin function
[in wo [Pnname [WO [Name [Basan
Not used Open:
FL grid drive (1GB ~ 7GB).
FL segment drive
P47, 46
P45 ~40, 37
1GB~7GB
P34 ~ 36
o | B2,B1,COM
P32, 33
P31
P30
CNVss
RESET
XIN
XOUT
19~21
22, 23
Not used (Open).
—-—+—
BUSY
REQ
BUSY signal output pin for communicating to main microprocessor.
REQ signal input pin for communicating to main microprocessor.
Connect the GND.
Reset pin (H: Normal, L: Reset).
RESET
Oscillator connect pin (4MHz).
Not used (GND).
Not used (Open).
GND pin.
Not used (Open).
XCIN
XCOUT
Vss
R3
R2
R1
RO
VP
P17~PO0O5
50 ~ 62
P04 ~ POO
O
A1~A13
P27~P20
AVcc,
Vcc
DATA signal input pin for communicating to main micioprocessor.
CLOCK signal input pin for communicating to main micro processor.
Test mode setting pin (H: Test, L: Normal). Not Used.
Peak hold detection (H: Without, L: With). Not Used.
Connect the — 30V.
Fl segment drive (16B
~ 26B), (H: ON, L: OFF).
FL segment drive (1B
~ 13B), (H: ON, L: OFF).
Power supply pin (+5V).
22
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