s6b0724 Densitron Corporation, s6b0724 Datasheet - Page 24

• Manufacturer Part Number: s6b0724
• Description: 132 Seg / 65 Com Driver & Controller For Stn Lcd
• Manufacturer: Densitron Corporation

132 SEG / 65 COM DRIVER & CONTROLLER FOR STN LCD
Column Address Circuit
Column Address circuit has an 8-bit preset counter that provides column address to the Display Data RAM as shown
in figure 8. When set Column Address MSB / LSB instruction is issued, 8-bit [Y7: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. However, the counter is not increas ed and locked if a non-existing address above 84H. It is unlocked
if a column address is set again by set Column Address MSB / LSB instruction. 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 7.
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.
20
Column address [Y7:Y0]
LCD panel display
LCD panel display
Display data
SEG output
( ADC = 1 )
(ADC = 0)
Figure 9. The Relationship between the Column Address and the Segment Outputs
SEG
00H
0
1
SEG
01H
1
0
SEG
02H
2
1
SEG
03H
PRELIMINARY SPEC. VER. 1.1
3
0
... ...
... ...
... ...
... ...
SEG
80H
128
1
SEG
81H
129
1
SEG
82H
130
0
S6B0724
SEG
83H
131
0