Pin No.

Terminal

In/Out

Function

 

 

 

 

74 ~ 77

DB4 ~ DB7

Out

Data bus for the LCD driver

 

 

 

 

78

NC9

Not used

 

 

 

 

79

LVCC

In

+5 V source

 

 

 

 

80 ~ 84

KO8 ~ KO12

Out

Terminals for button scan signal

 

 

 

 

85 ~ 87

P65 ~ P67

Not used

 

 

 

 

88

RS

Out

Control signal for the LCD driver

 

 

 

 

89

R/W

Out

Read/Write signal for the LCD driver

 

 

 

 

90

E

Out

Chip enable signal for the LCD driver

 

 

 

 

91 ~ 95

P73 ~ P77

Not used

 

 

 

 

96

LGND

In

Ground source

 

 

 

 

97, 100

MA18, MA15

Out

Address bus

 

 

 

 

LCD DRIVER (LSI3: KS0066U-10B)

The LCD driver can drive a dot matrix LCD having 40 segment and 16 common lines. The LSI contains 240 graphic symbols in the built-in character generator ROM, and stores 80 characters in the built-in display data RAM. In accordance with command from the CPU, the LSI is capable of displaying up to 16 characters simultaneously. The following table shows the pin functions of LSI3.

Pin No.

Terminal

In/Out

Function

 

 

 

 

1 ~ 22,

SEG1 ~ SEG40

Out

Segment signal output

63 ~ 80

 

 

 

 

 

 

 

23

VSS

GND (0 V) source

 

 

 

 

 

 

 

Terminals for the built-in clock pulse generator. The

24, 25

OSC1, OSC2

In/Out

external resistor connected determines the oscillation

 

 

 

frequency.

 

 

 

 

 

 

 

LCD drive voltage input.

26 ~ 30

V1 ~ V5

In

Those voltages are used for generating the stepped

 

 

 

pulse of the LCD drive signals.

 

 

 

 

31, 32

LP, XCLS

Not used

 

 

 

 

33

VDD

In

DVDD (+5 V) source

 

 

 

 

34, 35

FR, DO

Not used

 

 

 

 

36

RS

In

Data/command determination terminal.

High: data, Low: command

 

 

 

37

R/W

In

Read/Write terminal. High: read, Low: write

 

 

 

 

 

 

 

Chip enable signal.

38

E

In

High: enable, the writing is done at fall edge.

 

 

 

Low: disenable

 

 

 

 

39 ~ 42

DB0 ~ DB3

Not used. Connected to GND (0 V)

 

 

 

 

43 ~ 46

DB4 ~ DB7

In/Out

Data bus

 

 

 

 

47 ~ 62

COM1 ~ COM16

Out

Common signal/output

 

 

 

 

— 5 —

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Casio casio electronic keyboard manual LCD Driver LSI3 KS0066U-10B

casio electronic keyboard specifications

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