Casio CTK-485 Service Manual page 7

Pin No. Terminal
80 ~ 84 KO8 ~ KO12
85 ~ 87 P65 ~ P67
88 RS
89 R/W
90 E
91 ~ 95 P73 ~ P77
96 LGND
97, 100 MA18, MA15
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
1 ~ 22,
SEG1 ~ SEG40
63 ~ 80
23 VSS
24, 25 OSC1, OSC2
26 ~ 30 V1 ~ V5
31, 32 LP, XCLS
33 VDD
34, 35 FR, DO
36 RS
37 R/W
38 E
39 ~ 42 DB0 ~ DB3
43 ~ 46 DB4 ~ DB7
47 ~ 62 COM1 ~ COM16
In/Out
Out Terminals for button scan signal
— Not used
Out Control signal for the LCD driver
Out Read/Write signal for the LCD driver
Out Chip enable signal for the LCD driver
— Not used
In Ground source
Out Address bus
In/Out
Out Segment signal output
— GND (0 V) source
Terminals for the built-in clock pulse generator. The external
In/Out
resistor connected determines the oscillation frequency.
LCD drive voltage input.
In Those voltages are used for generating the stepped pulse of
the LCD drive signals.
— Not used
In DVDD (+5 V) source
— Not used
Data/command determination terminal.
In
High: data, Low: command
In Read/Write terminal. High: read, Low: write
Chip enable signal.
In High: enable, the writing is done at fall edge.
Low: disenable
— Not used. Connected to GND (0 V)
In/Out Data bus
Out Common signal/output
— 6 —
Function
Function