HD44780 datasheet(34/59 Pages) HITACHI

部品番号	HD44780

部品情報	Dot Matrix Liquid Crystal Display Controller/Driver

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メーカー	HITACHI [Hitachi Semiconductor]

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HD44780U

34

Interface to Liquid Crystal Display

Character Font and Number of Lines: The HD44780U can perform two types of displays, 5

× 8 dot and

5

× 10 dot character fonts, each with a cursor.

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

Common Signals

Number of Lines

Character Font

Number of Common Signals

Duty Factor

15

× 8 dots + cursor

8

1/8

15

× 10 dots + cursor

11

1/11

25

× 8 dots + cursor

16

1/16

COM1

COM8

SEG1

SEG40

COM1

COM11

SEG1

SEG40

HD44780

Example of a 5

× 8 dot, 8-character × 1-line display (1/4 bias, 1/8 duty cycle)

Example of a 5

× 10 dot, 8-character × 1-line display (1/4 bias, 1/11 duty cycle)

HD44780

Figure 19 Liquid Crystal Display and HD44780 Connections

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