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• IC Pin Description
IC401 uPD789477GC-A28-8BT (SYSTEM CONTROL)
Pin No.
Pin Name
1 to 29
NC
30 to 37
SEG7 to SEG0
38
AVDD
39
FSEQ
40
CD OPEN
41
VERSION
42, 43
KEY1, KEY0
44 to 46
SW2 to SW0
47
AVSS
48
NC
49
AC IN
50
WRQ
51
50/60HZ
52
BUZZER
53
DATA-IN CD
54
DATA
55
CLK
56
LAT
57
DRF
58
XRST
59
A MUT
60
POWER ON
61
NC
62 to 68
SEG14 to SEG8
69
IC
70
XT1
71
XT2
72
VDD0
73
VSS0
74
X1
75
X2
76
RESET
77
RADIO ON
78
CD ON
79
CD/RADIO
80
NAP LED
I/O
—
Note used (Open)
O
LED segment driver signal output
—
Power supply pin (+3.3 V)
I
CD frame sync input
I
CD open detection signal input
I
Distination select signal input
I
Key data input
I
Switch data input
—
Ground
—
Not used (Pull down)
I
AC power failure detection signal input
I
CD write request data input
I
Time clock sync signal input
O
Beep sound output
I
CD serial data input
I/O
CD serial data input/ouput
O
CD serial clock output
O
CD latch signal output
I
CD DRF signal input
O
CD reset signal output
O
Audio mute control signal output
O
Power AMP standby control signal output
O
Not used (Pull down)
O
LED segment driver signal output
I
Not used (Pull down)
—
Sub system clock (32.768 kHz)
—
Sub system clock (32.768 kHz)
—
Power supply pin (+3.3 V)
—
Ground
—
Main system clock (4.19 MHz)
—
Main system clock (4.19 MHz)
—
System reset signal input
O
Radio power supply control signal output
O
CD power supply control signal output
O
CD/RADIO indicator drive signal output
O
NAP indicator drive signal output
Pin Description
ICF-CD837
31
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