em65567 ELAN Microelectronics Corp, em65567 Datasheet - Page 29

• Manufacturer Part Number: em65567
• Description: Com/ Color Driver
• Manufacturer: ELAN Microelectronics Corp

7.11 Display Data Structure and Gradation Control
For the purpose of gradation control, one pixel requires multiple bits of display RAM. The EM65567 has 3-bit or 2-bit data
per output to achieve the gradation display.
The three outputs of the segment driver are used for one pixel of RGB, and the EM65567 is connected to an STN color LCD
panel. It can display 96*66 pixels with 256 colors (3 bits * 3 bits * 2 bits). In this case, since the gradation display data is
processed by a single access to the memory, the data can be rewritten fast and naturally.
The weighting for each data bit is dependent on the status of the SWAP bit and the REF bit that is selected when data is
written to the display RAM.
* This specification is subject to be changed without notice.
(REF, SWAP)=(0,0) or (1,1)
LSB circuit
Gradation
0
DSEL
PSEL
palette Aj
D0
0
0
SEGAi
M SB
D1
0
0
Note : Internal X address : nH
LSB
D2
1
1
palette Bj
SEGBi
D3
0
0
M SB
D4
0
0
29
66 COM/ 96 SEG 256 Color STN LCD Driver
LSB
D5
1
1
: 5FH-nH
palette Cj
SEGCi
D6
1
1
(REF="0")
(REF="1")
M SB
D7
1
1
i=0 to 95
Gradation palette j=0 to 7
Gradation control
display RAM data
MPU write data X address: nH
Plane 0
Plane 1
2003/1/9 (V0.1)
EM65567