Table of Contents
Advertisement
4-4. IC PIN FUNCTION DESCRIPTION
•
KEY BOARD IC101 µPD17015GS-520-GJG
(SYSTEM CONTROLLER, LIQUID CRYSTAL DISPLAY DRIVER, KEY CONTROL)
Pin No.
Pin Name
1
PB2
2 to 5
PC0 to PC3
6
BEEP
7
BAND
8
BCHK
9
POWER
10
MUTE
11
CE
12
XOUT
13
XIN
14
VDD
15
GND
16
EO
17
VREG
18
VCOH
19
VCOL
20 to 28
LCD8 to LCD0
29 to 32 COM3 to COM0
33
VLCD1
34
C1
35
C0
36
VLCD0
37, 38
PB0, PB1
I/O
I
Key return signal input for the key matrix
O
Key scan signal output for the key matrix
O
Beep sound drive signal output terminal
O
FM/AM band selection signal output terminal "L": FM, "H": AM
—
Not used (open)
O
Power on/off control signal output for the radio system power supply "H": power on
O
Muting on/off control signal output to the headphone amplifier (IC2) "L": muting on
I
Power failure detection signal input from the voltage detect (IC102) Normally: "H"
O
System clock output terminal (75 kHz)
I
System clock input terminal (75 kHz)
—
Power supply terminal (+3V)
—
Ground terminal
O
PLL error signal output terminal
—
Power supply terminal (connected to the coupling capacitor)
I
FM VCO input terminal
I
AM VCO input terminal
O
Segment drive signal output to the liquid crystal display (LCD101)
O
Common drive signal output to the liquid crystal display (LCD101)
—
—
Terminal for doubler circuit capacitor connection to develop liquid crystal display drive voltage
—
—
I
Key return signal input for the key matrix
Description
– 15 –
Advertisement
Table of Contents
