Look-Up Table (Lut); Lut Registers - Epson S1D13503 Technical Manual

Page 20

3.2 Look-Up Table (LUT)

This section provides a concise description of the LUT registers, followed by a description of the color and monochrome
LUTs. Next is a series of examples which show how to initialize the LUTs, create an inverted LUT, and how to select one
of four banks in both the 4 gray shade and color modes.

3.2.1 LUT Registers

AUX[0E] Look-Up Table Address Register
I/O address = 1110b, Read/Write
Green Bank Green Bank
Bit 1 Bit 0
The S1D13503 has three internal 16 position, 4-bit wide Look-Up Tables (also referred to as palettes). The 4-bit value
programmed into each table position determines the output gray shade / color weighting of display data. These tables are
bypassed in black-and-white (BW) display mode.
These three 16 position Look-Up Tables can be arranged in many different configurations to accommodate all the gray
shade / color display modes.
Refer to Look-Up Table Configurations on page 22 for formats.
bits 7-6
bits 5-4
S1D13503
X18A-G-002-06
Downloaded from Elcodis.com electronic components distributor
ID Bit / ID Bit /
RGB Index RGB Index
Bit 1 Bit 0
Green Bank Bits [1:0]
In 4-level gray / color display modes (2-bits/pixel), the 16 position Green palette is arranged into four, 4
position "banks". These two bits control which bank is currently selected. These bits have no effect in 16-
level gray / color display modes (4-bits/pixel).
In 256 color display modes (8-bit/pixel), the 16 position Green palette is arranged into two, 8 position
"banks" for the display of "green" colors. Only bit 0 of these two bits controls which bank is currently
selected.
ID Bit / RGB Index Bits [1:0]
These bits have dual purpose;
ID Bits: After "power on" or hardware reset, these bits can be read to identify the current revision of the
S1D13503. These same bits are used to identify the pin compatible S1D13502 and would only be used in
system implementations where common software is being used. As these bits are R/W they must be read
before being written in order to be used as ID bits.
Table 3-2: ID Bit Usage
Chip
S1D13503
Power On
reserved
or
S1D13502
RESET
S1D13502
Epson Research and Development
Palette Palette Palette
Address Address Address
Bit 3 Bit 2 Bit 1
Aux[0E]
bit 5 bit 4
0 0
0 1
1 0
1 1
Vancouver Design Center
Palette
Address
Bit 0
Programming Notes and Examples
Issue Date: 01/01/30