Icom ID-800H Service Manual page 21

4-6-2 D/A CONVERTER IC PORT ALLOCATIONS
(MAIN UNIT; IC11)
Pin Port
number name
Output the VHF bandpass filters
TUNE_V1–
2–4
TUNE_V3 (D22, D23, D29, D41) tuning signals.
Outputs the UHF bandpass fi lter (FI4)
5
TUNE_U
tuning signal.
Outputs the receiving attenuator con-
6 ATT
trol signal.
Outputs the bandpass fi lter shift con-
7 BSHIFT
trol signal.
Outputs the VHF output power con-
8 PCON_V
trol signal.
Outputs the UHF output power con-
9 PCON_U
trol signal.
Outputs the 800MHz bandpass fi lter
12 TUNE_8
tuning signal.
Outputs the reference oscillator con-
13
REF_CON
trol signal.
4-6-3 MODEM IC PORT ALLOCATION
(CODEC BOARD; IC252)
Pin Port
number name
Outputs 2.4576 MHz clock signal to
2 MCLK the AMBE voice CODEC IC (IC151,
pin 39).
Outputs the PLL bandwidth control
7 ACQ
signal while receiving.
Outputs transmitting data signal to
19 TXDT
the CODEC CPU (IC204, pin 54).
Input port for receiving data signal
20 RXDT from the CODEC CPU (IC204, pin
53).
Input port for receive clock signal
21 RXCK from the CODEC CPU (IC204, pin
52).
Outputs transmit clock signal to the
22 TXCK
CODEC CPU (IC204, pin 51).
Description
Description
4 - 11
4-6-4 SUB CPU PORT ALLOCATIONS
(CONTROL UNIT; IC6)
Pin Port
number name
Input port for [BAND•MODE].
Low: While [BAND•MODE] is
1 BAND
Outputs the LCD backlights (DS21,
DS22) control signal.
3 High: W h i l e a m b e r o r ye l l ow
COL_A
Input port for [S.MW•MW].
4 SMW
Low: While [S.MW•MW] is pushed.
Input port for [TONE•T-SCAN].
5 TONE Low: While [TONE•T-SCAN] is
Input port for [LOW•DUP].
6 LOW
Low: While [LOW•DUP] is pushed.
Input port for [MONI•DTMF].
7 MONI Low: W h i l e [ M O N I • D T M F ] i s
Input port for [SET•LOCK].
8 SET
Low: While [SET•LOCK] is pushed.
Input port for [M/CALL•PRIO].
24 M/CALL Low: While [M/CALL•PRIO] is
Input port for [V/MHz•SCAN].
25 VMHz Low: While [V/MHz•SCAN] is
DIAL_A, Input ports for control signals from
30, 31
DIAL_B the main dial.
Outputs the LCD backlights (DS21,
DS22) control signal.
83 COL_G High: While green or yellow back-
Input port for [PWR].
86 PWR
Low: While [PWR] is pushed.
88 VOL Input port for [VOL].
89 SQL Input port for [SQL].
Description
pushed.
backlights are selected in
the set mode.
pushed.
pushed.
pushed.
pushed.
lights are selected in the
set mode.