32
CDX-M620/M670
• IC702 HD643255A36F (SUB SYSTEM CONTROL) (MAIN BOARD)
Pin No. Pin Name I/O Pin Description
1 SA CLK O Not used. (Open)
2 PG4 O Not used. (Open)
3 VSS — Ground
4 NC — Not used. (Open)
5 VCC — Power supply pin (+ 5V)
6 – 9 PC0 – PC3 O Not used. (Open)
10 VSS — Ground
11 – 14 PC4 – PC7 O Not used. (Open)
15 – 18 PB0 – PB3 O Not used. (Open)
19 VSS — Ground
20 – 23 PB4 – PB7 O Not used. (Open)
24 – 27 PA0 – PA3 O Not used. (Open)
28 VSS — Ground
29 – 31 PA4 – PA6 O Not used. (Open)
32 SA EN IN I Connecting to ground in this set.
33 SPE LAT I Spectrum analyzer data latch signal
34 BU IN I Back-up power detection signal
35, 36 VSS — Ground
37 P65 O Not used. (Open)
38 BUS ON I BUS ON signal
39 VCC — Power supply pin (+5 V)
40 – 43 PE0 – PE3 O Not used. (Open)
44 VSS — Ground
45 DSP SEL I Spectrum analyzer data select signal
46 LED SW1 I Illumination select control signal 1
47 LED SW2 I Illumination select control signal 2
48 PE7 O Not used. (Open)
49 BU IN O Not used. (Open)
50 LINK OFF O Link OFF control signal
51 PD2 O Not used. (Open)
52 ILL ON O Illumination power control signal
53 VSS — Ground
54 – 56 PD4 – PD6 O Not used. (Open)
57 BOOT I Display CPU write-in control signal
58 VCC — Power supply pin (+5 V)
59 P30 O Not used. (Open)
60 LCD SO/TX O LCD driver serial data output
61 SP SI I Spectrum analyzer data input
62 RX I Flash CPU write-in data input
63 SP CKI I Spectrum analyzer clock input
64 LCD CKO O LCD driver serial clock output
65 VSS — Ground
66 LCD CEO O LCD driver chip enable output
67, 68 VSS — Ground
69 LCD INH O LCD driver inhibit control signal
70 LCD CE1 O LCD driver chip enable output
71 LCD CE2 O LCD driver chip enable output
72 – 78 P27 – P21 O Not used. (Open)
79 FL W O Flash write control signal
80 FW E I Flash write enable signal
81 SYS RST I System reset signal
82 NMI I Non maskable interrupt signal
