Icom IC-M802, Service Manual

Page: 17 / 79

3 - 11
3-7-8 FRONT CPU PORT ALLOCATIONS (RC-25,
DISPLAY BOARD; IC8201)
Pin
number
17
21
22
23
24
25
26
28
31
32
33
34
35
36
41–46
48–55
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
Port
name
DSEL
FUNK
TXK
RXK
FCHK
T0K
ENTK
PWRK
PMUT
FPTT
AFGL
M1AD
M2AD
M3AD
CL1
RS
RD
WR
RES
CS
DB7–DB0
T9K
T8K
T7K
T6K
T5K
T4K
T3K
T2K
T1K
EMLK
SETK
MODK
TUNK
DALK
CSCK
DSTK
Description
Outputs DISTRESS LED control sig-
nal.
Input port for the
O
switch.
Input port for the [TX] switch.
Input port for the [RX] switch.
Input port for the [FREQ/CH] switch.
Input port for the [0] switch.
Input port for the [ENT] switch.
Input port for the [POWER] switch.
Input port for the phone plug insert
detection signal.
Input port for the [PTT] switch from the
microphone connector (J8701, pin 5).
Input port for the AF volume control.
Input port for the using microphone
detection signal.
Input port for the switch signal on the
microphone.
Input port for the microphone connect-
ing detection.
Output LCD drive signals.
Output LCD drive signals.
Input port for the [9] switch.
Input port for the [8] swtich.
Input port for the [7] swtich.
Input port for the [6] switch.
Input port for the [5] switch.
Input port for the [4] switch.
Input port for the [3] switch.
Input port for the [2] switch.
Input port for the [1] switch.
Input port for [e-mail]/[DSC]/[TS]
switches.
Input port for the [SET] switch.
Input port for the [MODE] switch.
Input port for the [TUNE] switch.
Input port for [CANCEL]/[TELCALL]/
[TXF] switches.
Input port for [DSC]/[CALL]/[CH0]/
[SELCALL] switches.
Input port for the [DISTRESS]/[CALL]/
[ALM] switches.