Cpu (Main Unit; Ic25) Port Allocation - Icom ID-880H Service Manual

4-4 CPU (MAIN UNIT; IC25) PORT ALLOCATION

PIN
LINE NAME
No.
Audio response select signal.
3 AN "H"=FM mode.
"L"=DV mode.
Cut-off frequency shifting signal to the
4 DA_SEL
HPF (IC48).
MIC mute signal to the MIC mute switch
5 MM_MUTE (IC30).
"H"=MIC mute.
ALC amplifier control signal to the AF
6 DCONT switches (IC29 and IC52).
"H"=ALC amplifi er ON.
1200_ Baud rate select signal to the packet
8
9600SEL modulation select switch (IC30).
9 P_PTT Packet PTT detect signal.
10 P_SQL Packet squelch control signal.
Microphone sensitivity select signal.
11 MIC_SENC
"H"=High sensitivity.
Modulation mute signal to the digital
16 DADJSEL
modulation switch (IC34).
Modulation line switching signal to the
17 MOD_DA MOD mute switches (IC9 and IC67).
"H"=Modulation enable.
22 PLLSTB Strobe signal to the PLL IC ( IC14).
AM-demodulator circuit control signal.
"L"= While receiving in AM mode (AM-
23 AMC
modulator and AGC circuits are
activated).
To n e f i l t e r sw i t c h i n g s i g n a l t o t h e
LPF (Q100).
24 DTCS_SEL
"H"=DTCS mode.
"L"=CTCSS mode.
RX circuits control signal.
25 R5C
"H"=RX circuits is activated.
2nd IF filter (Wide/Narrow) toggling
signal.
26 WN_SEL
"H"=Narrow.
"L"=Wide.
Transmitting control signal to the UT8 line
28 UTX_C regulator (Q13, 17).
"H"=While transmitting in UHF band.
VCO oscillating frequency shift signal to
29 VCO_SHIFT
the VHF VCO switch (Q110).
32 PLLCK Clock signal to the PLL IC (IC14).
33 PLLDATA Data to the PLL IC (IC14).
34 UNLOCK PLL unlock signal from the PLL IC ( IC41).
Modulation mute signal to the MOD mute
35 MMUTE switch (Q64).
"H"=Modulation muted.
Transmitting control signal to the VT8 line
36 VTX_C regulator (Q12, 15).
"H"=While transmitting in VHF band.
Lock-up time control signal to the loop
37 PLLSW fi lter.
"H"=Fast lock-up time.
VCO power control signal to the VCO
38 UVCO_SEL select switch (Q65, 68).
"L"=UHF VCO is activated.
VCO power control signal to the VCO
39 VVCO_SEL select switch (Right band VHF; Q65, 68).
"H"=VHF VCO is activated.
Power control signal for the digital
48 D5VC
converter circuits.
Switching signal to the AF fi lter (Q47).
52 AFFIL_SEL "H"=FM
"L"=AM/DV
55 DTCS DTCS and CTCS signals.
DESCRIPTION
PIN
LINE NAME
I/O
No.
56 DTMF
O
57 MIC_SEL
O
62 MICUD
O 63 AMRSSI
64 RSSI
O
65 IDET
O
66 HVin
I
69 WXALT
O
70 DTCS_IN
O
71 TEMP
76 SCL
O
77 AF_VOL_CK
O
AF_VOL_
78
DATA
O
80 PWR
82 SDA
O
85 MIC_PTT
O 101 SQL
103 CL_SFT1
107 ACQ
O
108 98_DATA
109 TXDT
O
110 TXCK
O
111 RXDT
O
112 RXCK
O
113 AMBERES
I
114 AMBECLK
O
115 AMBEEPR
116 AMBESTB
O
122 RX_DATA
123 TX_DATA
O
127 TX232
128 RX232
129 DA_CK
O
130 DA_DATA
131 AMBETXD
O
132 AMBETRD
134 DA_STB
O
142 MOD_MUTE Packet modulation mute signal.
143 FIL1(143pin)
O
144 FIL2(144Pin)
O
4 - 7
DESCRIPTION
Beep, DTMF and european tone (E880
only) signals.
Connected microphone detect signal.
[UP]/[DWN] key input from connected
microphone (HM-154).
Inputs RSSI signal (for AM mode) from
the AGC line controller (Q44).
While receiving; inputs RSSI signal from
the IF IC (IC15).
Current level from the current detector
(IC55, D163).
Divided voltage of the HV line.
Demodulated Weather alert signal from
the AF fi lter. ([USA] only)
Demodulated CTCSS and DTCS signals
from the CTCSS fi lter (Q41).
Transceiver's internal temparature from
the thermal detector circuit (R509).
I/O port for clock signal to the EEPROM
(IC22).
Serial clock signal to the electric volume
IC (IC66).
Data signal to the electric volume IC
(IC66).
Power control signal to the PWR controller
(Q82).
"H"=While the transceiver power is ON.
Data signal to the EEPROM (IC22).
Input port for [PTT] key on the connected
microphone.
Noise signal from the IF IC (IC15).
Clock frequency shift signal.
ACQ signal to the modem IC (IC1012).
Communication signal to the connected
microphone (HM-133).
TX data (DV) to the modem IC (IC1012).
TX clock signal (DV) to the modem IC
(IC1012).
RX data (DV) to the modem IC (IC1012).
RX clock signal (DV) to the modem IC
(IC1012).
Reset signal to the DSP CODEC (IC1006). O
Clock signal to the DSP CODEC (IC1006). O
EPR (Encode Packet Ready) signal to the
DSP CODEC (IC1006).
Strobe signal to the DSP CODEC (IC1006). O
Data lines for the control unit.
Data lines for the control unit.
Data bus for RS-232C communication.
Data bus for RS-232C communication.
Serial clock signal to the D/A converter.
Serial data to the D/A converter.
AMBE RX signal.
AMBE TX signal.
Strobe signal to the D/A converter.
AF fi lter circuits control signals.
I/O
O
I
I
I
I
I
I
I
I
I
I/O
O
O
O
I/O
I
I
O
O
I/O
O
O
I
I
O
I
O
O
I
O
O
I
O
O
O
O