Port Allocations - Icom IC-208H Service Manual

4-6 PORT ALLOCATIONS

4-6-1 MAIN CPU PORT ALLOCATIONS
(MAIN UNIT; IC505)
Pin Port
number name
Outputs the transmit mute signal.
16 TX_MUTE
High : While transmit is muting.
Input port for the microphone PTT sig-
17 MIC_PTT nal.
High : While PTT switch is pushed.
Outputs the UHF transmitting power
supply circuit control signal.
20 UTXC
High : While transmitting (400–479
Outputs the VHF transmitting power
supply circuit control signal.
21 VTXC
High : While transmitting (136–174
Outputs the DTCS filter select signal.
DTCS_SEL High : While the DTCS signal is
22
I/O port for the serial data to the EEP-
24 ES_DATA
ROM (IC501, pin 5).
Outputs the clock signal to the EEP-
25 ES_CK
ROM (IC501, pin 6).
Input port for the packet [PTT] switch.
26 P-PTT Low : While the packet [PTT] switch
Outputs the packet modulation muting
P_MOD_MUTE signal.
27
Low : While muting.
28 98_DATA Input port for the HM-98's data signal.
Input port for the connecting micro-
phone detect signal.
31 MIC_SEL
Low : While the HM-98 is connect-
38 SQL Input port for the squelch level signal.
Input port for the RSSI signal from the
40 RSSI FM IF IC (IC8, pin 12) to detect receiv-
ing signal strength.
Input port for the transceiver's internal
41 TEMP
temperature signal.
Input port for the WX alert (1050 Hz)
42 WXALT
signal.
Outputs DTMF, E-TONE and BEEP
44 DTMF
signals.
45 DTCS Outputs CTCSS and DTCS signals.
Outputs the packet squelch control
47 P_SQL signal.
High : While the squlech is opened.
Outputs the cooling fan control signal.
48 FAN_CTRL High : While the cooling fan is
49 CLONE_OUT Outputs the cloning signal.
Description
MHz)
MHz)
transmitting.
is ON
ed.
worked.
(MAIN unit; IC505)–Continued
Pin Port
number name
50 CLONE_IN
51 DA_DATA
52 DA_CK
53 DA_STB
55 AF_MUTE
56 PLLSTB2
57 PLLSTB1
58 DET_MUTE
62 MIC_SENS
63 U_VCO
1200_9600SEL
65
66 RX800
67 RX400
72 RXUHF
73 RXVHF
74 MMUTE
77 MIC_MUTE
78 R5CTRL
4 - 9
Description
Input port for the cloning signal.
Outputs the data signal to the D/A
CONVERTER (IC11, pin 17).
Outputs the clock signal to the D/A
CONVERTER (IC11, pin 16).
Outputs the strobe signal to the D/A
CONVERTER (IC1, pin 15).
Outputs the AF mute control signal.
High : While AF signal is muting.
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 the detector circuit is
muting.
Outputs microphone sensitivity control
signal.
High : The sensitivity is high.
Outputs the UHF VCO control signal.
High : The VCO circuit oscillates
320–999.99 MHz signal.
Outputs packet baud rate select sig-
nal.
Low : 9600 bps is selected.
Outputs the 800_R5 regulator (Q29)
control signal.
High : While receiving
MHz.
Outputs the 400_R5 regulator (Q28)
control signal.
High : While receiving
MHz.
Outputs the UHF_R5 regulator (Q27)
control signal.
High : While receiving
MHz.
Outputs the VHF_R5 regulator (Q26)
control signal.
High : While receiving
MHz.
Outputs modulation mute control sig-
nal to the VCO circuits.
High : While modulation is muting.
Outputs the microphone muting con-
trol signal.
Low : While the microphone is
muted.
Outputs the R5 regulator (Q24) control
signal.
Low : While receiving.
630–999
230–630
430–450
118–174