HD44780 datasheet(21/59 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

21

Timing Generation Circuit

The timing generation circuit generates timing signals for the operation of internal circuits such as

DDRAM, CGROM and CGRAM. RAM read timing for display and internal operation timing by MPU

access are generated separately to avoid interfering with each other. Therefore, when writing data to

DDRAM, for example, there will be no undesirable interferences, such as flickering, in areas other than the

display area.

Liquid Crystal Display Driver Circuit

The liquid crystal display driver circuit consists of 16 common signal drivers and 40 segment signal

drivers. When the character font and number of lines are selected by a program, the required common

signal drivers automatically output drive waveforms, while the other common signal drivers continue to

output non-selection waveforms.

Sending serial data always starts at the display data character pattern corresponding to the last address of

the display data RAM (DDRAM).

Since serial data is latched when the display data character pattern corresponding to the starting address

enters the internal shift register, the HD44780U drives from the head display.

Cursor/Blink Control Circuit

The cursor/blink control circuit generates the cursor or character blinking. The cursor or the blinking will

appear with the digit located at the display data RAM (DDRAM) address set in the address counter (AC).

For example (Figure 8), when the address counter is 08H, the cursor position is displayed at DDRAM

address 08H.

AC6

0

AC5

0

AC4

0

AC3

1

AC2

0

AC1

0

AC0

0

1

00

2

01

3

02

4

03

5

04

6

05

7

06

8

07

9

08

10

09

11

0A

1

00

40

2

01

41

3

02

42

4

03

43

5

04

44

6

05

45

7

06

46

8

07

47

9

08

48

10

09

49

11

0A

4A

AC

cursor position

Display position

DDRAM address

(hexadecimal)

Display position

DDRAM address

(hexadecimal)

For a 1-line display

For a 2-line display

Note: The cursor or blinking appears when the address counter (AC) selects the character

generator RAM (CGRAM). However, the cursor and blinking become meaningless.

The cursor or blinking is displayed in the meaningless position when the AC is a CGRAM address.

Figure 8 Cursor/Blink Display Example

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