RMU800A SERVICE MANUAL
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4. Flash ROM: AT29C020-90T1(TX-RX Unit IC103)
4-1 Pin Function
Pin No.
Name
I/O
Function
1
~
6, 9
~
20, 31
A18
~
A0
I
Flash ROM address bus.
7
WR
I
Flash ROM write enable.
8 VCC
+5V.
21
~
23, 25
~
29 D0
~
D7
I/O
Flash ROM data bus.
24 VSS
GND.
30
CE
I
Flash ROM chip enable.
32
OE
I
Flash ROM output enable.
5. EEPROM: AT2408N12.5S(TX-RX Unit IC105)
5-1 Pin Function
Pin No.
Name
I/O
Function
1
~
3 A0
~
A2
I Address
inputs.
4 GND
GND.
5 SDA
I/O
Serial
Data.
6
SCL
Serial clock input.
7 TEST
Test.
8 VCC
+5V.
28
HMBL
MIC backlight control signal output.
29
HOOK/RXD0
Hook signal input/ Serial data input.
30
TXD0
O
PC commands (TXD)/connects to PTT.
31
RLED
O
Red LED output.
32
GLED
O
Green LED output.
33 PTT
O PTT/connect
to
TXD0.
34 DNKEY
I Up
key.
35 UPKEY
I Down
key.
36 KEYBL
I Key
backlight.
37 IN1
Not
used.
38 IN2
Not
used.
39
PF6
I
PF6 Key Input.
40
PF5
I
PF5 Key Input.
41
PF4
I
PF4 Key Input.
42
PF3
I
PF3 Key Input.
43
PF2
I
PF2 Key Input.
44
PF1
I
PF1 Key Input.
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