Kenwood TH-77A Service Manual page 21

SEMICONDUCTOR DATA
Microcomputer HD404608A71H (Control Unit IC12)
Pin Functions
D4
DS
Description
IA-/fA/E
Transmission power selection Low: H; Middle: H; High: L
CTCSS (TSU-7) power on/off "H": Off: "L": On
D6
Cross-band repeater on/off "L": Off; "H": On
D7
Destination input
D8
Destination input
D9
Destination input
D10
Destination input
D11/VCref
PTT switch input
D12/COMPO Serial interface transmission request input "H": Active
16 RO1/SI
D13/COMP1
ROO/SCK
RO2/SO
Serial interface serial busy input "H": Active
Serial interface clock
Serial interface serial input
Serial interface serial output
RO3
R10
Microphone muting "L": Off; "H": On
Key matrix output
R11
Key matrix output
R12
Oo
Key matrix output
R13
24
2
26
27
28
29
30
74
75
77
R20
R
R31/TIMO
R32/INTO
R33/INT1
OSC!
OSC2
DO
01
D2
D3
0
|
|
Key matrix output
Key matrix output
Key matrix output 21
5 R22 Key matrix output
R23
}
:
Sy
Transmission power selection Low: H; Middle: L; High: L
|
| Key matrix output
|
|
21