Sony MZ-R37 KEY3, KEY2, KEY1, Xint REC SW, LCD Reset, Fsi Nc, Spoff, Rsi, SDI1, SDO1, SCK1, Beep

Pin No.	Pin name	I/O	Pin Description
50	AVSS	—	Ground terminal for A/D converter.
51	AVREF	I	A/D converter reference voltage input.
52	AVDD	—	A/D converter power supply terminal.
53	VLG2-MNT	I	DSP power monitor signal.
54	TEMP	I	Temp meter (IC802) input.
55	KEY3	I	Key input.
56	KEY2	I	Key input.
57	KEY1	I	Key input.
58	XINT REC SW	I	Recording head position detect input.
59	UNREG MNT	I	2.8 V voltage monitor input.
60	BAT VC	I	Battery detect signal input.
61	FG IN	I	FG input from motor driver (IC503).
62	NC	—	Not used (Open).
63	FOK PORT	I	Focus OK signal input.
64	––––		— Not used (Open).
65	LCD RESET	O	LCD reset signal output.
66	XJACKDET	I	LINE IN (OPTICAL) jack detection input.
67	OPT DET	I	LINE IN (OPTICAL) optical detection input.
68	XMIC DET	I	MIC (PLUG IN) jack detection.
69	(NC)	—	Not used (Open).
70	FSI (NC)	—	Not used (Open).
71	SPOFF	O	REC head motor control signal output.
72	RSI	O
73	RH PWM	O	RH constant current control signal output.
74	(NC)	—	Not used (Open).
75	DQSY	I	Subcode Q sync (SCOR) of digital in U-bit CD format from IC601.
76	T COUNT	I	Traverse count signal input.
77	SDI1	I	Serial data input.
78	SDO1	O	Serial data output.
79	SCK1	O	Serial clock output.
80	SQSY	I	SUB-Q/ADIP SYNC input.
81	BEEP	O	BEEP sound output control.
82	XLAT	O	Latch output.
83	NC	—	Not used (Open).
84	TEX	—	Not used (Fixed at “L”).
85	TX	—	Not used (Fixed at “L”).
86	VSS	—	Ground.
87	VDD	—	Power supply pin (+2.8V).
88	NC	—	Not used (Fixed at “H”).
89	XCS ADA	O	A/D, D/A converter chip select output.
90	XPD ADA	O	A/D, D/A converter power down signal output. H : Power down
91	KEY ON	O	SLEEP : L, action : H.
92	XNIMH DET (NC)	—	Not used (Open). (Battery detect switch input.)
93	A MUTE	O	Analog mute control. H : Mute
94	XOPT CTL	O	Power supply control output for an optical input.
95	FFCLR	O	Flip flop clear signal output.
96	XCE NV	O	EEPROM chip select output.
97	SENS	I	SENS input.
98	LDON	O	“H” : APC circuit ON, “L” : APC circuit OFF
99	XSHOCK	I	Track jump detection input from IC601.
100	CLV STB	O	CLV drive control signal output.

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