Pin No.
Pin Name
I/O
Description
________
RES
HCTR
VDD
FMIN
AMIN
VSS
E0
AIN
AOUT
AGND
TEST1
XIN
System reset input.
Universal counter dedicated input port.
Power supply pin.
FM VCO (local oscillator) input.
AM VCO (local oscillator) input.
Ground pin.
The main charge pump output.
Transistor used for the low-pass filter amplifier. Connect AGND to ground.
IC test pins. These pins must be tied to ground.
Connections for a 75kHz crystal oscillator element.
53
54
55
56
57
58
59
60
61
62
63
64
I
I
—
I
I
—
O
O
O
O
I
I
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
47
48
49
50
51
52
IC, LC72343G
Pin No.
Pin Name
I/O
Description
IC DESCRIPTION
XOUT
TEST2
PA3
PA2
PA1
PA0
PB3
PB2
PB1
PB0
PC3
PC2
PC1
PC0
PD3
PD2
PD1
________
INT/PD0
PE1
BEEP/PE0
PF2
PF1/ADI1
PF0/ADI0
VSS
PG3/S20
PG2/S19
PG1/S18
COM2
COM1
DBR4
DBR3
DBR2
DBR1
O
I
I
I
I
I
O
O
O
O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
O
O
I
I
I
—
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
O
O
O
O
O
—
—
—
—
Connections for a 75kHz crystal oscillator element.
IC test pins. These pins must be tied to ground.
Special-purpose key return signal input port.
Special-purpose key source signal output port.
General-purpose I/O port.
General-purpose output port.
General-purpose input and A/D converter input shared function port.
Ground pin.
LCD driver segment output and general-purpose I/O shared function port.
LCD driver segment output pins.
LCD driver common output pins.
LCD power supply stepped-up voltage pins.
22
21
w w w . x i a o y u 1 6 3 . c o m
Q Q 3 7 6 3 1 5 1 5 0
9
9
2
8
9
4
2
9
8
T E L
1 3 9 4 2 2 9 6 5 1 3
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299