Ic Pin Function Description - Sony XR-CA670X Service Manual

6-10. IC PIN FUNCTION DESCRIPTION

• MAIN BOARD IC501 MN101C49KSK (SYSTEM CONTROLLER)
Pin No. Pin Name
1 VREF–
2 VSM
3 NIL
KEYIN1
4
KEYIN0
5
6 RC_IN0
QUALITY
7
8 NIL
9 DSTSEL
10 VREF+
VDD
11
OSC2
12
OSC1
13
14 VSS
XI
15
XO
16
17 MMOD
LCDSO
18
LCDCE
19
LCDCKO
20
21 to 23 NCO
24 SYSRST
25 BUSON
26 KEYACK
27
DAVN
28 BU_IN
29 SIRCS
30
TUATT IN
31 NIL
32 VDD2
33 RESET
34 TUNON
35
BEEP
36, 37
NCO
38 ACCIN
39 NCO
40 TELATT
41
NIH
42 BUSSO
43 BUSSI
44 BUSCKO
I/O
I Reference voltage (0V) input terminal (for A/D converter)
I FM and AM signal meter voltage detection signal input from the tuner unit (A/D input)
I Not used
I Key input terminal (A/D input)
I Key input terminal (A/D input)
I Rotary remote commander key input terminal (A/D input)
I Noise level detection signal input from the tuner unit (A/D input)
I Not used
I Destination setting terminal
I Reference voltage (+5V) input terminal (for A/D converter)
—
Power supply terminal (+5V)
O Main system clock output terminal (18.432 MHz)
I Main system clock input terminal (18.432 MHz)
— Ground terminal
I Sub system clock input terminal (32.768 kHz)
O Sub system clock output terminal (32.768 kHz)
Selection signal of memory mode input terminal
I
"L": single chip mode (fixed at "L" in this set)
O Serial data output to the liquid crystal display driver
O Chip enable signal output to the liquid crystal display driver "H" active
O Serial data transfer clock signal output to the liquid crystal display driver
O Not used
O
System reset signal output to the SONY bus interface "L": reset
O Bus interface control signal output to the SONY bus interface "L": bus on
Input of acknowledge signal for the key entry Acknowledge signal is input to accept function
I
and eject keys in the power off status On at input of "H"
I Synchronized detection signal of RDS data block input from the RDS decoder "H" active
I Battery detection signal input from the SONY bus interface "L" is input at low voltage
I SIRCS remote control signal input from the remote control receiver
I
Tuner muting on/off control signal input from the tuner unit "L": muting on
I Not used
I
Power supply terminal (+5V)
System reset signal input from the reset signal generator and reset switch "L": reset
I
"L" is input for several 100 msec after power on, then it changes to "H"
O Tuner system power supply on/off control signal output "H": tuner power on
O Beep sound drive signal output to the power amplifier
O Not used
I Accessory detection signal input "L": accessory on
O Not used
Telephone attenuate signal input At input of "H", the signal is attenuated by –20 dB
I
Not used
I Not used
O Serial data output to the SONY bus interface
I Serial data input from the SONY bus interface
O Serial data transfer clock signal output to the SONY bus interface
Description
XR-CA670X
23