LG TCH-M550, Service Manual

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61 AVSS AVSS I/O I - Ground for A/D converter and D/A converter
62 P130/ANO0 N.C. I/O I CMOS Not to be used (Open)
63 P131/ANO1 N.C. I/O I CMOS Not to be used (Open)
64 AVREF1 AVREF1 I/O I - Reference voltage applied to A/D converter
65 P70/RxD2/SI2 N.C. I/O I CMOS Not to be used (Open)
66 P71/RxD2/SO2 PFRT_DO I/O I CMOS To LCD driver, data output
67 P72/ASCK2/SCK2 PFRT_CLK I/O I CMOS Clock output for interface with LCD driver
68 P20/RxD1/SI1 PPLL_DI I/O I - From PLL IC, data input
69 P21/TxD1/SO1 PPLL_DO I/O I CMOS To PLL IC, data output
70 P22/ASCK1/SCK1 PPLL_CLK I/O I CMOS Clock output for interface with PLL IC
71 P23/PCL PPLL_CE I/O I CMOS PLL IC enable output
72 P24/BUZ PBEEP - - CMOS Beep sound output (2.4kHz)
73 P25/SIO/SDA0 PDSP_IDA I/O O - From DSP, data input
74 P26/SO0 PDSP_ODA I/O O CMOS To DSP, data output
75 P27/SCK0/SCL0 PDSP_OCLK I/O O CMOS Clock output for interface with DSP
76 P80/A0 N.C. I/O O CMOS Not to be used (Open)
77 P81/A1 N.C. I/O O CMOS Not to be used (Open)
78 P82/A2 N.C. I/O I - Not to be used (Open)
79 P83/A3 PST I/O I - Sterep indigater's signal or SD signal input
80 P84/A4 PRDS_DI I/O I - From tuner pack, RDS data input
81 P85/A5 PORT_IN0 I/O I - For diode option check, signal 1 or 2 input 0
82 P86/A6 PORT_IN1 I/O I - For diode option check, signal 1 or 2 input 1
83 P87/A7 PORT_IN2 I/O I - For diode option check, signal 1 or 2 input 2
84 P40/AD0 PORT_OUT0 I/O O CMOS For diode option check, signal 1 output
85 P41/AD1 PORT_OUT1 I/O O CMOS For diode option check, signal 2 output
86 P42/AD2 PCD_EJT I/O I - Eject key input
87 P43/AD3 PFRT-CE I/O O CMOS LCD driver enable output
88 P44/AD4 PFRT-RES I/O O CMOS LCD driver reset output
89 P45/AD5 PFRT_DET I/O I - Front pannel existence signal input
90 P46/AD6 PANT I/O O CMOS Antenna control output
91 P47/AD7 PZCC I/O I - From ISO jack, ACC signal input
92 P50/A8 N.C. I/O O CMOS Not to be used (Open)
93 P51/A9 N.C. I/O O CMOS Not to be used (Open)
94 P52/A10 N.C. I/O O CMOS Not to be used (Open)
95 P53/A11 N.C. I/O O CMOS Not to be used (Open)
96 P54/A12 N.C. I/O O CMOS Not to be used (Open)
97 P55/A13 N.C. I/O O CMOS Not to be used (Open)
98 P56/A14 N.C. I/O O CMOS Not to be used (Open)
99 P57/A15 N.C. I/O O CMOS Not to be used (Open)
100 Vss VSS - - - Ground
input port setted 26
output port setted 31
Used I/O port 57
Interrupt 4
A/D Converter 4