hd66740 Renesas Electronics Corporation., hd66740 Datasheet - Page 24

• Manufacturer Part Number: hd66740
• Description: 112 X 80-dot Graphics Lcd Controller/driver - Hitachi Semiconductor
• Manufacturer: Renesas Electronics Corporation.

HD66740
Display Line Control
NL3-0: Set NL2–NL0 bits when SW = 0, and the NL3 bit when SW = 1 to specify the display lines.
Display lines change the liquid crystal display drive duty ratio.
depend on the number of display lines.
Table 9
NL3
0
0
0
0
0
0
0
0
1
1
CN1–CN0: Set CN1–CN0 bits when SW = 1.
dots below and display starts from COM17. When the liquid crystal is driven at low duty in the system
wait state, it can display partially at the center of the screen. For details, see the Partial-display-on
Function section.
When CN1–CN0 = 10, the display position is shifted by 8 dots above and second-line display starts from
COM1. The 8 dots of the first line are moved to the lowest edge of the display screen. The output
position of the lowest edge depends on the drive duty setting. In vertical smooth scrolling, PS1–PS0
bits can selectively fixed-display only the first to the third lines. Combining these functions enables the
fixed display of one line of the lowest edge. For details, see the Partial Smooth Scroll Display Function
section.
NL2
0
0
0
0
1
1
1
1
0
0
NL Bits and Display Lines
NL1
0
0
1
1
0
0
1
1
0
0
R/W RS DB7
0
NL0
0
1
0
1
0
1
0
1
0
1
0
Graphics
Display
112 x 8 dots
112 x 16 dots
112 x 24 dots
112 x 32 dots
112 x 40 dots
112 x 48 dots
112 x 56 dots
112 x 64 dots
112 x 72 dots
112 x 80 dots
Figure 8
0
DB6 DB5 DB4 DB3 DB2 DB1
0
Display-line Control Instruction
1
LCD Drive
Duty
1/8 Duty
1/16 Duty
1/24 Duty
1/32 Duty
1/40 Duty
1/48 Duty
1/56 Duty
1/64 Duty
1/72 Duty
1/80 Duty
When CN1–0 = 01, the display position is shifted by 16
1
24
1
NL2
CN1
Common
Driver Used
COM1–COM8
COM1–COM16
COM1–COM24
COM1–COM32
COM1–COM40
COM1–COM48
COM1–COM56
COM1–COM64
COM1–COM72
COM1–COM80
NL1 NL0
CN0 NL3
CGRAM address mapping does not
DB0
(SW = 0)
(SW = 1)