hd66717 Renesas Electronics Corporation., hd66717 Datasheet - Page 22

• Manufacturer Part Number: hd66717
• Description: Low-power Dot-matrix Liquid Crystal Display Controller/driver -
• Manufacturer: Renesas Electronics Corporation.

HD66717
Table 8
Notes: 1. The lower 2 bits of the character code correspond to the upper two bits of the CGRAM address
474
2. CGRAM address bits 0 to 2 designate the character pattern raster-row position. The 8th raster-
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.
5. A set bit in the CGRAM data corresponds to display selection, and 0 to non-selection.
Bits 3 and 2 of the character code are invalid (*). Therefore, for example, the character codes
* Indicates no effect.
(2 bits: 4 types).
row is the cursor position and its display is formed by a logical OR with the cursor.
(00)H and (08)H correspond to the same CGRAM address.
Example of Relationships between Character Code (DDRAM) and Character Pattern
(CGRAM Data)
D7 D6 D5 D4 D3 D2 D1 D0
Character code (DDRAM data)
0
0
0
0
0
0
0
0
*
*
*
*
0
1
0
1
A4 A3
0
1
CGRAM address
0
1
A2 A1 A0
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
(Don't care)
(Don't care)
O7
*
*
MSB
O6
*
*
O5
*
*
CGRAM data
O4 O3 O2 O1 O0
1 0 0 0 1
1 0 0 0 1
1 0 0 0 1
0 1 0 1 0
0 0 1 0 0
0 0 1 0 0
0 0 1 0 0
0 0 0 0 0
1 0 0 0 1
1 0 0 0 1
1 0 0 0 1
0 1 0 1 0
0 0 1 0 0
0 0 1 0 0
0 0 1 0 0
0 0 0 0 0
LSB
Character
pattern
(1)
Character
pattern
(4)