Icom IC-7700

3 - 5
3-4 MAIN CPU (IC604) PORT ALLOCATIONS
Pin
No.
Description
IN/
OUT
Condtion
42
Clock signal to 4094/LMX2306 (PLL UNIT).
(DDS for 1st LO PLL-IC/DDS, 2nd TX LO DDS, 3rd TX LO)
O
43
"Serial data to 4094/LMX2306 (PLL UNIT).
(DDS for 1st LO PLL-IC/DDS, 2nd TX LO DDS, 3rd TX LO)
O
44 N/C O
45 Mode status (1Lo or T2Lo) output. O
46 Chip select siganl to PLL. I/O
47 Strobe to the PLL. O
51 Clock signal to units other than PLL and SCOPE. O
52 Serial data (other than PLL, SCOPE and DSP). O
53 N/C O
54 CI-V format data (UART). O
55 CI-V format data (UART). I
56 Clock to the DSP IC. O
57 Seral data (TXD/RXD) to the DSP. O
58 START signal to the TUNER UNIT (UART, 9600). O
142 Serial data to the DAC (BU9480) for ext. S-meter. O
140 Clock (A-clock) to the DAC (BU9480) for ext. S-meter. O
138 Clock (B-clock) to the DAC (BU9480) for ext. S-meter. O
137 Power line for liner circuit control signal. O "H"=Power ON
113 Forword wave detected voltage (A/D). I
114 Refl ected wave detected voltage (A/D). I
115 ALC fedback voltage (A/D). I
116 Drain current (fi nal amp.). I
117 Drain voltage (fi nal amp.). I
118 PA UNIT temparature. I
119 Cooling fan motor current. I
120 Voltage from key pad (rear panel). I
133 Serial data to the FRONT CPU (UART, 38400). O
134 Serial data from the FRONT CPU (UART, 38400). I
135 CW/RTTY keying signal to the DSP. O "L"=Key pushed
81 Mute control signal. I "H"=Mute
82 TX power line control signal. O "L"=TX
83 Noise pulse. I
105 RX power line control signal. O "L"=RX
3 Serial communication with the scope DDS (AD9857) detect signal. O "H"=detected
33 Serial data to the SCOPE UNIT DDS/PLL/DSP. O
34 Strobe to the scope PLL (LMX2306). O
59 Chip selet signal to the scope DDS (AD9857). O "L"=AD9875 is slected
60 Profi le (0/1) select signal to the scope DDS (AD9857). O "H"=Profi le 1 is selected.
61 Clock signal to the DDS/PLL/DSP. O
121 DSP data (TXD/RXD). I
122 Hand shake signal from SCOPE DSP. I
123 Extra port for SCOPE DSP. I
124 Serial data from SCOPE DSP. I
125 N/C I
126 Through signal from the TUNER UNIT. I "H"=Through
127 Key input from the tUNER UNIT. I "H"=Tuner ON
128 Straight key input (A/D). I "L"=Key pushed