HD44780U Datasheet, PDF (20/59 Pages) Hitachi Semiconductor – Dot Matrix Liquid Crystal Display Controller/Driver

HD44780U
Table 5
Relationship between CGRAM Addresses, Character Codes (DDRAM) and Character
Patterns (CGRAM Data) (cont)
For 5 × 10 dot character patterns
Character Codes
(DDRAM data)
76543210
High
Low
0000*00*
CGRAM Address
543210
High
Low
0000
0001
0010
0011
0100
00 0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
0000
0001
Character Patterns
(CGRAM data)
76543210
High
Low
***
***
***
00000
00000
10110
11001
10001
10001
11110
10000
10000
10000
00000
*****
Character
pattern
Cursor position
*** *****
***
0000*11*
11 1001
1010
1011
1100
1101
1110
1111
***
*** *****
*** *****
Notes: 1. Character code bits 1 and 2 correspond to CGRAM address bits 4 and 5 (2 bits: 4 types).
2. CGRAM address bits 0 to 3 designate the character pattern line position. The 11th line is the
cursor position and its display is formed by a logical OR with the cursor.
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.
3. Character pattern row positions are the same as 5 × 8 dot character pattern positions.
4. CGRAM character patterns are selected when character code bits 4 to 7 are all 0.
However, since character code bits 0 and 3 have no effect, the P display example above can be
selected by character codes 00H, 01H, 08H, and 09H.
5. 1 for CGRAM data corresponds to display selection and 0 to non-selection.
* Indicates no effect.
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