HD44780UA02TF datasheet(19/59 Pages) HITACHI

Part #	HD44780UA02TF

Description	Dot Matrix Liquid Crystal Display Controller/Driver

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Manufacturer	HITACHI [Hitachi Semiconductor]

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HD44780U

19

Table 5

Relationship between CGRAM Addresses, Character Codes (DDRAM) and Character

Patterns (CGRAM Data)

Character Codes

(DDRAM data)

CGRAM Address

Character Patterns

(CGRAM data)

76543210

0000

*

000

0000 * 001

0000 * 111

543210

000

001

111

76543210

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

*

High

Low

High

Low

High

Low

Character

pattern (1)

Cursor position

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

Character

pattern (2)

Cursor position

For 5

× 8 dot character patterns

Notes: 1. Character code bits 0 to 2 correspond to CGRAM address bits 3 to 5 (3 bits: 8 types).

2. CGRAM address bits 0 to 2 designate the character pattern line position. The 8th line is the

cursor position and its display is formed by a logical OR with the cursor.

Maintain the 8th line data, corresponding to the cursor display position, at 0 as the cursor display.

If the 8th line data is 1, 1 bits will light up the 8th line regardless of the cursor presence.

3. Character pattern row positions correspond to CGRAM data bits 0 to 4 (bit 4 being at the left).

4. As shown Table 5, CGRAM character patterns are selected when character code bits 4 to 7 are

all 0. However, since character code bit 3 has no effect, the R display example above can be

selected by either character code 00H or 08H.

5. 1 for CGRAM data corresponds to display selection and 0 to non-selection.

* Indicates no effect.

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