hd66717 Renesas Electronics Corporation., hd66717 Datasheet - Page 31

• Manufacturer Part Number: hd66717
• Description: Low-power Dot-matrix Liquid Crystal Display Controller/driver -
• Manufacturer: Renesas Electronics Corporation.

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.
Table 11
NL1
0
0
1
1
NL0
0
1
0
1
NL Bits and Display Lines
Number of Display Lines
1
2
3
4
Figure 13 Display Control Instruction
RS R/W DB7
0
0
0
0
1 NL1 NL0 DL3 DL2 DL1
LCD Drive Multiplexing Duty Ratio
1/10
1/18
1/26
1/34
DB0
HD66717
483