SED1374 Datasheet, PDF (109/420 Pages) Epson Company – SED1374 Embedded Memory Color LCD Controller

Epson Research and Development
Vancouver Design Center
Page 13
3.1.4 Eight Bit-Per-Pixel (256 Colors)
In eight bit-per-pixel mode one byte of display buffer represents one pixel on the display.
At this color depth the read-modify-write cycles, required by the lessor pixel depths, are
eliminated.
Each byte of display memory consists of three pointers into the Look-Up Table. The three
most significant bits form an index into the first eight red values. The next three bits are an
index into the first eight green values. The last two bits form an index into the first four blue
Look-Up Table entries.
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Red bit 2
Red bit 1
Red bit 0 Green bit 2 Green bit 1 Green bit 0 Blue bit 1
Blue bit 0
Figure 3-4: Pixel Storage for 8 Bpp (256 Colors) in One Byte of Display Buffer
Programming Notes and Examples
Issue Date: 99/04/27
SED1374
X26A-G-002-02