Sony Ericsson CDX-M620 service manual IC702 HD643255A36F SUB System Control Main Board

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

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