S6B0755 Datasheet, PDF (20/68 Pages) Samsung semiconductor – 128 SEG / 65 COM DRIVER & CONTROLLER FOR STN LCD

S6B0755
PRELIMINARY SPEC. VER. 1.0
128 SEG / 65 COM DRIVER & CONTROLLER FOR STN LCD
Column Address Circuit
Column address circuit has a 7-bit preset counter that provides column address to the Display Data RAM as
shown in Figure 9. When set Column Address MSB / LSB instruction is issued, 7-bit [Y6:Y0] is updated. And,
since this address is increased by 1 each a read or write data instruction, microprocessor can access the display
data continuously. And the Column Address counter is independent of page address register.
ADC Select instruction makes it possible to invert the relationship between the column address and the segment
outputs. It is necessary to rewrite the display data on built-in RAM after issuing ADC Select instruction. Refer to
the following Figure 8.
SEG output
SEG
0
SEG
1
SEG
2
SEG
3
... ...
SEG
124
SEG
125
SEG
126
SEG
127
Column address [Y6:Y0] 00H 01H 02H 03H ... ... 7CH 7DH 7EH 7FH
Display data
1
0
1
0
1
1
0
0
LCD panel display
... ...
( ADC = 0 )
LCD panel display
... ...
( ADC = 1 )
Figure 8. The Relationship between the Column Address and the Segment Outputs
Segment Control Circuit
This circuit controls the display data by the Display ON / OFF, reverse display ON / OFF and entire display ON /
OFF instructions without changing the data in the display data RAM.
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