Casio CTK-611 Service Manual page 10

Pin No. Terminal
42 , 44, 46 ~ 48,
EA0 ~ EA12
51 ~ 59, 61
45
49
50
60
62, 66, 70, 74, 78
63, 67, 71, 75, 79
64, 65, 68, 69,
PA0 ~ PA5
72, 73
76, 77
LCD DRIVER (LSI401: SED1278F2A)
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 LSI 401.
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 Address bus for the effect RAM
ECEB Out Chip enable signal output for the effect RAM
EOEB Out Read enable signal output for the effect RAM
VSS3 In Ground (0 V) source
EWEB Out Write enable signal output for the effect RAM
VSS2 In Ground source
VDD2 In +5 V source
Out Button scan signal output
PA6/7 Out Not used
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
— 8 —
Function
Function