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SEMICONDUCTOR DATA
« HD4074608FS explanation of terminals
Pin No.
Symbol
1/0 | Signal name
Description
During save
1
D2
ie)
SK
Serial clock for EEPROM.
H
2
D3
@)
DI
Data output for EEPROM.
H
3
D4
!
DO
Data input for EEPROM.
H
.
4
D5
fe)
LAMP1
Lamp drive output.
H
'
5
D6
me)
PTT
Request signal output (ANI, Repertory dial).
L
6
D7
|
KSO
Serial input from main microprocessor.
H
7
D8
(@)
KS!
Serial output to main microprocessor.
H
.
8
D9
|
DTMF16
12 key/16 key select. ''L'' : 12 key, 'H" : 16 key
9
D10
|
10
D11/VCret
|
11
D12/COMPO
I
12
D13/COMP1
I
PTT|
Request signal input (Manual DTMF).
L
13
TEST
|
14
X1
|
15
X2
@)
.
16
GND
-
17
ROO/SCK
40
7
18
RO1/SI
YO
| 19
R02/SO
VO
20
RO3
ie)
|
21 ~ 24
R10 ~ R13
ie)
C1 ~ C4
Key matrix sense output. Usually ''H"
H
25 ~28
R20 ~ R23
|
R1 ~ R4
Key matrix sense input. Usually ''L"' of pull-down resistor.
29
R30
0
30
R31/TIMO
1)
31
R32/INTO
@)
LAMP2
Lamp drive output.
H
32
R33/INT1
VO
EP46
1K/4K select. 'L" : 1K EEPROM, ''H" : 4K EEPROM
33 ~ 36]
SEG1 ~ SEG4
eo)
LCD segment drive output (1st figure).
37~40|
SEG5 ~ SEG8
ie)
LCD segment drive output (2nd figure).
41 ~44|/
SEGS ~ SEG12
ie)
LCD segment drive output (3rd figure).
45 ~ 48)
SEG13 ~ SEGI6
ie)
LCD segment drive output (4th figure).
49 ~ 52|
SEG17 ~ SEG20
0
LCD segment drive output (5th figure).
53 ~ 56|
SEG21
~ SEG24
ie)
LCD segment drive output (6th figure}
57 ~60|
SEG25 ~ SEG28
@)
LCD segment drive output (7th figure).
61 ~ 64]
SEG29 ~ SEG32
ie)
LCD segment drive output (8th figure).
65 ~ 68;
COM1
~ COM4
10)
LCD common
output.
69 ~ 71
V1~V3
-
72
TONEC
16)
DTMFC
DTMF colum output (analog output),
~
73
TONER
1e)
DTMFR
DTMEF row output (analog output).
74
VTref
-
Connect to Vcc.
75
Vec
-
76
Osci
|
,
77
OSC2
ie)
78
RESET
I
Reset input.
.
79
DO
O
cS1
Chip selector for EEPROM.
H
80
D1
O
CS2
Chip selector for EEPROM.
H
40
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