SED1374 Datasheet, PDF (111/420 Pages) Epson Company – SED1374 Embedded Memory Color LCD Controller

Epson Research and Development
Vancouver Design Center
Page 15
Look-Up Table Address
The Look-Up Table (LUT) consists of 16 indexed entries each consisting three 4-bit
elements (red, green, blue). The LUT Address bits select which of the 16 entries is
accessed. Upon setting the LUT Address an internal pointer is set to the red element.
Dependent on the RGB Index setting one to three accesses of the Look-Up Table Data
register cause the LUT Address to automatically increment to the next index.
REG[16h] Look-Up Table Bank Select Register
n/a
n/a
Red Bank
Select bit 1
Red Bank
Select bit 0
Green Bank Green Bank Blue Bank
Select bit 1 Select bit 0 Select bit 1
Read/Write
Blue Bank
Select bit0
Look-Up Table Bank Select
The Look-Up Table Bank Select register affects displayed colors.
Depending on the color mode, not all of the sixteen Look-Up Table (LUT) entries are
required. This register determines which entries will be displayed.
At 1-bpp only the lower eight Look-Up Table addresses are used. These are further divided
into four banks of two colors. The bank selects determine which of the four red, green and
blue banks the displayed colors will come from. For instance: Assume the Look-Up Table
Bank Select register was set to 18h (0001 1000 b). Red pixels would come from the 2nd red
lookup bank (red LUT Addresses 2 and 3). Green would be taken from the 3rd green lookup
bank (green LUT addresses 4 and 5). Blue pixels would be taken from the 1st blue lookup
bank (blue LUT addresses 0 and 1).
Programming Notes and Examples
Issue Date: 99/04/27
SED1374
X26A-G-002-02