Port Allocations - Icom ID-800H Service Manual

4-6 PORT ALLOCATIONS

4-6-1 MAIN CPU (MAIN UNIT; IC505)
Pin
Port name
number
Outputs the transmit mute signal.
16 TX-MUTE
Input port for the microphone PTT
signal.
17 MIC-PTT
Outputs the UT8 regulator control
signal.
20 UTXC
Outputs the VT8 regulator control
signal.
21 VTXC
Outputs the DTCS fi lter select signal.
22
DTCS_SEL
I/O port for data signals from/to the
24 ES_DAT
EEPROM (IC501, pin 5).
Outputs clock signal to the EEPROM
25 ES_CK
(IC501, pin 6).
Input port for the PTT control signal
from the connected TNC.
26 P_PTT
Outputs the packet modulation mute
P_MOD_ control signal.
27
MUTE
Input port for data signal from the
28 98_DATA
HM-133.
Input port for the connected micro-
phone detect signal.
31 MIC_SEL
Input port for the squelch level signal
39 SQL
from the FM IF IC (IC8, pin 14).
Input port for the S-meter signal from
40 RSSI
the FM IF IC (IC8, pin 12).
Input port for the transceiver's inter-
41 TEMP
nal temperature detection.
Input port for the WX alert (1050 Hz)
42 WXALT
signal.
Output DTMF, 1750 Hz TONE and
44 DTMF
BEEP signals.
45 DTCS Output CTCSS and DTCS signals.
Outputs packet squelch control sig-
47 P_SQL nal.
Outputs the cooling fan control sig-
nal.
48 FAN_CT
Outputs the data signal to the D/A
51 DA_DATA
converter (IC11, pin 17).
Outputs the clock signal to the D/A
52 DA_CK
converter (IC11, pin 16).
Description
High: While transmit is muted.
High: W h i l e P T T s w i t c h i s
pushed.
High: While transmitting on UHF
band.
High: While transmitting on VHF
band.
High: W h i l e t r a n s m i t t i n g t h e
DTCS signal.
Low: While transmitting for the
packet operation.
Low: While packet modulation is
muted.
Low: While the HM-133 is con-
nected.
High: While squelch is opened.
High: While cooling fan is acti-
vated.
Pin
Port name
number
53 DA_STB
55
AF_MUTE
56 PLLSTB2
57 PLLSTB1
58 DET_MUTE
62 MIC_SENS
63 U_VCO
1200_
65
9600SEL
66 RX800
67 RX400
72 RXUHF
73 RXVHF
74 MMUT
78 R5CTRL
81 V_VCO
83 PLLSW
84 ULCK
90 PLLDATA
91 PLLCK
99 WN_SEL
4 - 10
Description
Outputs the strobe signal to the D/A
converter (IC11, pin 15).
Outputs AF mute control signal.
High: While AF signal is muted.
Outputs the strobe signal to the UHF
PLL IC (IC2, pin 11).
Outputs the strobe signal to the VHF
PLL IC (IC1, pin 11).
Outputs the detector circuit mute sig-
nal.
High: While detector circuit is
muted.
Outputs microphone sensitivity con-
trol signal.
High: The sensitivity is high.
Outputs the UHF VCO control signal.
High: While operating on 230–
999.99 MHz.
Outputs the packet baud rate select
signal.
Low: When 9600 bps is selected.
Outputs the 800_R5 regulator (Q29)
control signal.
Low: While receiving on 810–
999.99 MHz.
Outputs the 400_R5 regulator (Q28)
control signal.
Low: While receiving on 230–550
MHz.
Outputs the UHF_R5 regulator (Q27)
control signal.
Low: While receiving 430–450
MHz.
Outputs the VHF_R5 regulator (Q26)
control signal.
Low: While receiving on 136–174
MHz.
Outputs the modulation mute control
signal to the VCO circuits.
High: While modulation is muted.
Outputs the R5 regulator (Q24) con-
trol signal.
Low: While receiving.
Outputs the VHF VCO control signal.
High: While operating on 136–
174 MHz.
Outputs the PLL loop control signal.
Input port for the PLL unlock signal.
High: The PLL circuit is unlocked.
Outputs the PLL data signal to the
PLL ICs (IC1, IC2).
Outputs the PLL clock signal to the
PLL ICs (IC1, IC2).
Outputs the wide/narrow FM select
signal.
High: While wide FM is selected.