HD66717 Datasheet, PDF (31/90 Pages) Hitachi Semiconductor – (Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver)

HD66717
Display Control
The display control instruction (Figure 13) includes the NL and DL bits.
NL1, NL0: Designates the number of display lines. This value determines the LCD drive multiplexing
duty ratio (Table 11). The address assignment is the same for all display line modes.
DL3–DL1: Doubles the height of characters on a specified line. The first, second, or third line is doubled
in height when DL1, DL2, or DL3 = 1, respectively. Two lines can be simultaneously doubled in a 4-line
display. Refer to the Double-Height Display section.
RS R/W DB7
DB0
0 0 0 0 1 NL1 NL0 DL3 DL2 DL1
Figure 13 Display Control Instruction
Table 11 NL Bits and Display Lines
NL1
NL0
0
0
0
1
1
0
1
1
Number of Display Lines
1
2
3
4
LCD Drive Multiplexing Duty Ratio
1/10
1/18
1/26
1/34
483