SED1354 Datasheet, PDF (155/472 Pages) Epson Company – Color Graphics LCD/CRT Controller

Epson Research and Development
Vancouver Design Center
Page 15
3.3 Look-Up Table (LUT)
This section provides a description of the LUT registers, followed by a description of the color and
gray shade LUTs and a discussion of the banks available in the 2 and 8 bit-per-pixel (bpp) modes.
The SED1354 LUT is only used for the panel interface. The optional RAMDAC is used to determine
the colors for the CRT. See Section 6, “CRT Considerations” on page 33.
3.3.1 Look-Up Table Registers
REG[24h] Look-Up Table Address Register
n/a
n/a
RGB Index
Bit 1
RGB Index
Bit 0
REG[26h] Look-Up Table Data Register
n/a
n/a
n/a
n/a
REG[27h] Look-Up Table Bank Register
n/a
n/a
Red Bank
Select Bit 1
Red Bank
Select Bit 0
Read/Write
LUT Address LUT Address LUT Address LUT Address
Bit 3
Bit 2
Bit 1
Bit 0
Read/Write
LUT Data
Bit 3
LUT Data
Bit 2
LUT Data
Bit 1
LUT Data
Bit 0
Read/Write
Blue Bank
Select Bit 1
Blue Bank
Select Bit 0
Green Bank Green Bank
Select Bit 1 Select Bit 0
The SED1354 LUT Registers are located at offsets 24h, 26h and 27h. They consist of a LUT address
register, data register and bank register. Refer to the SED1354 Hardware Functional Specification
document number X19A-A-002-xx for more details.
RGB Index
Selects which LUT to program. If set for Auto-increment, it will start at the Red LUT of the Index
selected. Then with consecutive writes/reads it will increment to Green, then Blue of the same index,
it will then increment the index and start at the Red LUT again.
Auto-increment algorithm:
1. Set RGB Index to 0 for Auto-increment, set LUT address to 0 (i.e. REG[24h]=00h).
2. While count < or = to (16*3), write data byte to REG[26h].
R, G or B Index select algorithm:
1. Set RGB Index to R(01b), G(10b), or B(11b), set LUT address to 0 (e.g.
REG[24h]=10h).
2. While count < or = 16, write data byte to REG[26h], increment LUT address.
LUT Address
Selects start index of the LUT in which to read data from, or write data to. Bank select has no effect
on the CPU read/write to the LUT.
LUT Data
4-bit data value to write.
Programming Notes and Examples
Issue Date: 98/10/28
SED1354
X19A-G-002-06