HD66724 Datasheet, PDF (44/117 Pages) Hitachi Semiconductor – (Graphics LCD Controller/Driver with Key Scan Function)

HD66724/HD66725
Display Line Control
NL2-0: Specifies the display lines. Display lines change the liquid crystal display drive duty ratio.
DDRAM address mapping does not depend on the number of display lines.
R/W RS DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
0 0 0 0 1 1 1 NL2 NL1 NL0
Figure 15 Display Line Control Instruction
Table 22 NL Bits and Display Lines
NL2 NL1 NL0 Display Lines
0
0
0
Segment display
0
0
1
One character line
+ segment display
0
1
0
Two character lines
+ segment display
0
1
1
Three character lines
+ segment display
1*
*
Setting inhibited
Liquid Crystal Display
Drive Duty Ratio
1/2 Duty
1/10 Duty
Common Driver Used
COMS1, COMS2
COM1-8, COMS1, COMS2
1/18 Duty
COM1-16, COMS1, COMS2
1/26 Duty
COM1-24, COMS1, COMS2
Double-Height Display Control
DL3-1: Specifies the double-height display for a given line. When DL1 = 1, the first line is displayed at
double height. When DL2 = 1, the second line is displayed at double height. When DL3 = 1, the third line
is displayed at double height. Double-height display of multiple lines is possible. For details, see the
Double-Height Display section.
R/W RS DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
0 0 0 1 0 0 0 DL3 DL2 DL1
Figure 16 Double-Height Display Control Instruction
Vertical Scroll Control 1/2
SN2-0: Specifies the display start line output from COM1. Because DDRAM is assigned a 5-line display
area, data is displayed sequentially from the first line to the fifth line then repeated from the first line again.
SL2–0: Selects the top raster-row to be displayed (display-start raster-row) in the display-start line
specified by SN2 to SN0. Any raster-row from the first to eighth can be selected (Table 24). This function
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