HD44780 Hitachi Semiconductor (acquired by Renesas), HD44780 Datasheet - Page 34

• Manufacturer Part Number: HD44780
• Description: Dot Matrix Liquid Crystal Display Controller/driver
• Manufacturer: Hitachi Semiconductor (acquired by Renesas)

HD44780U
Interface to Liquid Crystal Display
Character Font and Number of Lines: The HD44780U can perform two types of displays, 5
5
Up to two lines are displayed for 5 8 dots and one line for 5 10 dots. Therefore, a total of three
types of common signals are available (Table 9).
The number of lines and font types can be selected by the program. (See Table 6, Instructions.)
Connection to HD44780 and Liquid Crystal Display: See Figure 19 for the connection examples.
Table 9
Number of Lines
1
1
2
34
10 dot character fonts, each with a cursor.
Common Signals
HD44780
HD44780
Figure 19 Liquid Crystal Display and HD44780 Connections
COM11
SEG40
SEG40
Character Font
5
5
5
COM1
COM8
COM1
SEG1
SEG1
Example of a 5
Example of a 5
8 dots + cursor
10 dots + cursor
8 dots + cursor
8 dot, 8-character
10 dot, 8-character
Number of Common Signals
8
11
16
1-line display (1/4 bias, 1/8 duty cycle)
1-line display (1/4 bias, 1/11 duty cycle)
Duty Factor
1/8
1/11
1/16
8 dot and