25
XR-CA300/CA320/CA320X
5-7.
IC PIN FUNCTION DESCRIPTION
•
MAIN BOARD IC1 MN101C49GTH (SYSTEM CONTROLLER)
Pin No.
Pin Name
I/O
Description
1
VREF –
—
Reference voltage (0V) terminal (for A/D converter)
2
VSM
I
FM and AM signal meter voltage detection input from the FM/AM tuner unit (TU100)
(A/D input)
3 to 6
NCI
I
Not used (fixed at “L”)
7
NOISE-DET
I
Not used (fixed at “L”)
8
MPTH
I
Not used (fixed at “L”)
9
NCI
I
Not used (fixed at “L”)
10
VREF +
—
Reference voltage (+5V) terminal (for A/D converter)
11
VDD
—
Power supply terminal (+5V)
12
OSC2
O
Main system clock output terminal (18.432MHz)
13
OSC1
I
Main system clock input terminal (18.432MHz)
14
VSS
—
Ground terminal
15
XI
I
Sub system clock input terminal (32.768kHz)
16
XO
O
Sub system clock output terminal (32.768kHz)
17
MMOD
I
Setting terminal for the single chip mode “L”: single chip
18
LCD-SO (TX)
O
LCD serial data output to the liquid crystal display driver (IC900)
19
LCD-SI (RX)
I
LCD serial data input from the liquid crystal display driver (IC900)
20
LCD-CKO
O
LCD serial transfer clock signal output to the liquid crystal display driver (IC900)
21
TU-SDA
O
Serial data output to the FM/AM tuner unit (TU100)
22
TU-SI
I
Serial data input from the FM/AM tuner unit (TU100)
23
TU-SCL
O
Serial data transfer clock signal output to the FM/AM tuner unit (TU100)
24
LCD-RES
O
LCD reset signal output to the liquid crystal display driver (IC900) “L”: reset
25
LCD-CE
O
Chip enable signal output to the liquid crystal display driver (IC900) “H” active
26
KEYACK
I
Key acknowledge signal detect input from the liquid crystal display driver (IC900)
27
DAVN-RDS
I
Not used (fixed at “L”)
28
B/U-IN
I
Battery detect signal input from the SONY bus interface (IC800) and battery detect circuit
“L” is input at low voltage
29
NCI
I
Not used (fixed at “L”)
I
Internal RAM reset detection signal input terminal
Input terminal to check that RAM data are not destroyed due to low voltage
This checking is made within 100 msec after reset “L”: RAM reset
I
Setting terminal for the test mode “L”: test mode, Normally: fixed at “H”
I
Not used (fixed at “L”)
I
System reset signal input from the reset signal generator (IC2) and reset switch (S1)
“L”: reset “L” is input for several 100 msec after power on, then it changes to “H”
O
Chip enable signal output to the FM/AM tuner unit (TU100) “H” active
O
Beep sound drive signal output to the power amp (IC500)
O
Main system power supply on/off control signal output terminal “H”: power on
37
ILL-IN
I
Not used (fixed at “H”)
38
ACC-IN
I
Accessory detect signal input terminal “L”: accessory on
39
NCO
O
Not used (open)
40
TEL-MUTE
I
Telephone muting signal input terminal At input of “H”, the signal is attenuated by –20 dB
Used for the XR-CA320/CA320X only
41
NCI
I
Not used (fixed at “H”)
42
UNI-SO
O
Serial data output to the SONY bus interface (IC800)
43
UNI-SI
I
Serial data input from the SONY bus interface (IC800)
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