HD66717 Datasheet, PDF (22/90 Pages) Hitachi Semiconductor – (Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver)

HD66717
Table 8
Example of Relationships between Character Code (DDRAM) and Character Pattern
(CGRAM Data)
Character code (DDRAM data)
D7 D6 D5 D4 D3 D2 D1 D0
0000* * 00
CGRAM address
MSB CGRAM data LSB
A4 A3 A2 A1 A0 O7 O6 O5 O4 O3 O2 O1 O0
00
0 0 0 ***
0 0 1 (Don't care)
010
011
100
101
110
111
10001
10001
10001
01010
00100
00100
00100
00000
Character
pattern
(1)
0000* * 11
11
0 0 0 ***
0 0 1 (Don't care)
010
011
100
101
110
111
10001
10001
10001
01010
00100
00100
00100
00000
Character
pattern
(4)
Notes: 1. The lower 2 bits of the character code correspond to the upper two bits of the CGRAM address
(2 bits: 4 types).
2. CGRAM address bits 0 to 2 designate the character pattern raster-row position. The 8th raster-
row is the cursor position and its display is formed by a logical OR with the cursor.
3. The upper three bits of the CGRAM data are invalid; use the lower five bits.
4. When the upper four bits (bits 7 to 4) of the character code are 0, CGRAM is selected.
Bits 3 and 2 of the character code are invalid (*). Therefore, for example, the character codes
(00)H and (08)H correspond to the same CGRAM address.
5. A set bit in the CGRAM data corresponds to display selection, and 0 to non-selection.
* Indicates no effect.
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