Sony CDX-GT550 User Manual

39

52

KEYACK

I

Key acknowledgment detect signal input

53

TU ATTIN

I

Tuner mute zero cross detect signal input (AEP, UK model only)

54

BUIN

I

Back-up power supply detect signal input

55

NCO

O

Not used. (Open)

56

DAVN

I

RDS data block synchronized detect signal input (AEP, UK model only)

57

NCO

O

Not used. (Open)

58

UNISI

I

SONY bus data signal input

59

UNISO

O

SONY bus data signal output

60

UNISCK

O

SONY bus clock signal output

61

NCO

O

Not used. (Open)

62

NCO

O

Not used. (Open)

63

DOOR IND

O

CD IN LED control signal output    H: On

64

SIRCS

I

Remote control signal input

65

NCO

O

Not used. (Open)

66

FSW OUT

O

D/D converter oscillater frequency shift control signal output

L: 300 kHz, H: 400 kHz

67

DISP FLASHW

I

Display IC flash ROM write signal input

68

FLASH W

I

Memory mode select signal input    L: Write mode

69

NCO

O

Not used. (Open)

70

DOOR SW

I

Panel open/ close detect signal input    H: Panel open

71

RC IN1

I

Rotary commander shift key signal input

72

ACC IN

I

Accessory power supply detect signal input

73

TESTIN

I

Test mode detect signal input

74

TELATT

I

Telephone attenuate detect signal input

75

ILUIN

I

Auto dimmer illumination detect signal input    H: Ill off

76

XKEYON

O

A/D converter power supply control signal output

77

RESET

I

CPU reset signal input

78

NCO

O

Not used. (Open)

79

XIN

I

Sub-clock input (32.768 kHz)

80

XOUT

O

Sub-clock output (32.768 kHz)

81

VSS1

—

Ground pin

82

OSC OUT

O

Main-clock output (18.432 MHz)

83

OSC IN

I

Main-clock input (18.432 MHz)

84

VCC3

—

Power supply pin (+3.3 V)

85

SEL2

O

Not used in this set. (Open)

86

SEL5

O

Not used in this set. (Open)

87

BUSON

O

Bus on signal output

88

SEL3

O

Not used in this set. (Open)

89

EJECT OK

O

Eject OK signal output

90 to 92

NCO

O

Not used. (Open)

93

Z-MUTE

I

CD zero cross mute detect signal input

94, 95

NCO

O

Not used. (Open)

96

CYRIL SEL

I

Cyril select signal input    L: Cyril off, H: Cyril on

97

SEL4

O

Not used in this set. (Open)

98

CD ON

I

CD mechanism power control request signal input

99

CDM ON

I

CD mechanism deck power control request signal input

100

NCO

O

Not used. (Open)