Read Sony XDR-S50 Service Manual online
13
XDR-S50
• IC PIN DESCRIPTION
• IC501 µPD78F05476GC (S)-UBT-A (SYSTEM CONTROL) (MICRO COMPUTER BOARD)
Pin No.
Pin Name
I/O
Pin Description
1
BATT OFF
I
Battery off detect signal input (forced radio off)
2
LCD CONT
O
LCD power supply control signal output “H”: on, “L”: off
3
LIGHT
O
LCD back light control signal output “H”: on, “L”: off
4 to 9
P45 to P40
O
Not used in this set. (Open)
10
RESET
I
Reset signal input “L”: reset
11
XT2
I
Sub clock oscillation crystal pin (32.768 kHz)
12
XT1
O
Sub clock oscillation crystal pin (32.768 kHz)
13
FLMDO
I
Flash memory programing mode pull pin
14
EXCLK
I
Flash write clock signal input
15
XI
I
Not used in this set.
16
REGC
I
Regulator output stabillized capacitance connect pin (Connect to 0.47 µF.)
17
VSS
—
Ground pin
18
EVSS
—
Ground pin
19
VDD
—
Power supply pin
20
EVDD
—
Power supply pin
21 to 24
KS0 to KS3
O
Key source signal output 0 to 3
25
HOLD
I
Hold switch signal input “H”: on, “L”: off
26 to 29
NC
—
Not used. (Open)
30 to 33
KR7 to KR4
O
Key return signal output 7 to 4
34 to 36
KR3 to KR1
—
Not used in this set. (Open)
37
AMP SW
O
Audio amplifier operation switch signal output “H”: on, “L”: off
38
RADIO SW
O
DAB module operation switch signal output “H”: on, “L”: off
39
MUTE
O
Mute signal output “L”: on, “H”: off
40
AC CHK
I
AC adaputer connection detect signal input “H”: AC, “L”: DC
41
INTP2
I
Pull down pin (10 k
Ω
)
42
NC
—
Not used. (Open)
43 to 45
P51 to P53
—
Not used in this set. (Open)
46
RADIO OFF
I
Radio off voltage detect signal input “L”: Radio off
47
P17
—
Not used in this set. (Open)
48
INTP5
—
Not used in this set. (Open)
49
BEEP
O
Beep signal output
50
RXD6
I
Flash write signal input
51
TXD6
I
Flash write signal input
52
P12
—
Not used in this set. (Open)
53
RXD0
I
UART data signal input
54
TXD0
I
UART data signal output
55, 56
P54, P55
—
Not used in this set. (Open)
57
SHIMUKE2
I
Not used. (Pull down)
58
SHIMUKE1
I
Destination select signal input (Clock) “L”: 12H, “H”: 24H
59
AVREF
I
A/D converter reference voltage signal input
60
AVSS
—
Ground pin
61
VDET2
I
Reducing voltage detect signal input
62 to 68
P26 to P20
—
Not used in this set. (Open)
69
P130
—
Not used in this set. (Open)
70
NC
—
Not used. (Open)
71 to 74
P03 to P00
—
Not used in this set. (Open)
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