HD44780 Hitachi Semiconductor (acquired by Renesas), HD44780 Datasheet - Page 20

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

HD44780U
Table 5
Notes: 1. Character code bits 1 and 2 correspond to CGRAM address bits 4 and 5 (2 bits: 4 types).
20
For 5
2. CGRAM address bits 0 to 3 designate the character pattern line position. The 11th line is the
3. Character pattern row positions are the same as 5
4. CGRAM character patterns are selected when character code bits 4 to 7 are all 0.
5. 1 for CGRAM data corresponds to display selection and 0 to non-selection.
* Indicates no effect.
10 dot character patterns
Maintain the 11th line data corresponding to the cursor display positon at 0 as the cursor display.
If the 11th line data is „1“, „1“ bits will light up the 11th line regardless of the cursor presence.
Since lines 12 to 16 are not used for display, they can be used for general data RAM.
However, since character code bits 0 and 3 have no effect, the P display example above can be
cursor position and its display is formed by a logical OR with the cursor.
selected by character codes 00H, 01H, 08H, and 09H.
7 6 5 4 3 2 1 0
0 0 0 0 * 0 0
0 0 0 0
Patterns (CGRAM Data) (cont)
Relationship between CGRAM Addresses, Character Codes (DDRAM) and Character
High
Character Codes
(DDRAM data)
*
1 1
Low
*
*
CGRAM Address
5 4 3 2 1 0
0 0
1 1
High
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
0
1
1
1
1
Low
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
1
0
1
0
1
0
1
8 dot character pattern positions.
7 6 5 4 3 2 1 0
*
*
*
*
*
*
*
*
High
Character Patterns
*
*
*
*
*
*
*
*
(CGRAM data)
*
*
*
*
*
*
*
*
0
0
1
1
1
1
1
1
1
1
0
*
*
*
*
0
0
0
1
0
0
1
0
0
0
0
*
*
*
*
0
0
1
0
0
0
1
0
0
0
0
*
*
*
*
Low
0
0
1
0
0
0
1
0
0
0
0
*
*
*
*
0
0
0
1
1
1
0
0
0
0
0
*
*
*
*
Character
pattern
Cursor position