ICD-35, ICD-55 - Sony Audio Service Manual (repair manual). Page 11

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Pin No.

Pin Name

I/O

Function

74

XBCK

O

DSP bit clock signal output to the MSM7590L (IC101)

75

RTCDI

I

Serial data input from the RS5C348A (IC703)

76

RTCDO

O

Serial data and DSP register control data output to the RS5C348A (IC703)

77

RTCCLK

O

Serial data and DSP register control data transfer clock signal output to the RS5C348A (IC703)

78

IC

—

Fixed at “L”

79

X2

O

Main system clock output terminal (5 MHz)

80

X1

I

Main system clock input terminal (5 MHz)

81

VDD1

—

Power supply terminal (+3.3V)

82

XT1

I

Sub system clock input terminal (32.768 kHz)

83

XT2

O

Sub system clock output terminal (32.768 kHz)    Not used (open)

84

XRESET

I

System reset signal input from the reset signal generator (IC505)    “L”: reset
For several hundreds msec. after the power supply rises, “L” is input, then it changes to “H”

85

SYNCIN

I

Interrupt input terminal of the DSP X (R) sync

86

WAKEUP

I

Key interruption processing start signal input terminal

87

RTCINT

I

Interrupt input from the RS5C348A (IC703) (2 Hz)

88

—

O

Not used (open)

89

LPMODE

O

Filter selection signal output terminal    “L”: SP mode, “H”: LP mode

90

AVREFO

O

Reference voltage output terminal (for A/D converter)

91 to 98

FMIO0 to FMIO7

I/O

Two-way data bus with the flash memory (IC702) (bit 0 to bit 7)

99

AVSS

—

Ground terminal (for A/D converter)

100

BATT

I

Dry battery voltage detection signal input terminal (A/D input)