Sony CDX-MP450X Service Manual page 21

Pin No. Pin Name I/O
58 ANT ON O Car antenna control output
59 EZ SEL I Rotary commander shift key input
60 POWER ON O System power on/off control and power amplifier control output
61 – 63 NC — Not used. (Open)
64 ST IN I FM stereo indicator input (L: FM STEREO ON, H: FM MONO ON)
65 LCD CK0 O Clock data output for LCD driver IC.
66 LCD SO O Serial data output for LCD driver IC.
67 NC — Not used. (Open)
68 MSC O Serial clock output to slave microcomputer IC.
69 MSI I Serial input from slave microcomputer IC.
70 MSO O Serial output to slave microcomputer IC.
71 MSRQ I Serial request input from slave microcomputer IC.
72 MCS O Chip select output to slave microcomputer IC.
73 NC — Not used. (Open)
74 VREF — Reference power supply voltage pin
75 GND0 — Ground
76 X OUT O Crystal oscillator output (4.5 MHz)
77 X IN I Crystal oscillator input (4.5 MHz)
78 BU IN I Back-up power supply input
79 VDD0 — Power supply pin
80 RESET I Reset input
Pin Description
21 21
CDX-MP450X