S1D13503 Epson Electronics America, Inc., S1D13503 Datasheet - Page 124

• Manufacturer Part Number: S1D13503
• Description: S1d13503 Graphics Lcd Controller
• Manufacturer: Epson Electronics America, Inc.

Page 28
3.2.5 Four Colors (Two Bits/Pixel in Color Mode)
S1D13503
X18A-G-002-06
When the S1D13503 is configured for two bit pixels in color mode, each pixel can index one of four color LUT entries.
The 16 LUT entries are divided into four separate Look-Up tables or banks, each having four entries (see Figure 6). The
following examples show how to program and select these banks.
Example 7:
1.
2.
3.
4.
5.
Determine location of bank 3 in the red LUT.
The first four entries in the 16 entry LUT represent the first bank (bank 0). The following four entries in the LUT rep-
resent the second bank (bank 1), etc. Consequently bank 3 starts at LUT index 0Ch as shown below:
Red Bank 3 is shown in Figure 6.
Write LUT index and Red LUT selection to Look-Up Table Address Register AUX[0Eh].
AUX[0Eh] = LUT index ‘OR’ 0001 0000b
For bank 3, the index will one of the following values: 0Ch, 0Dh, 0Eh, or 0Fh, so the value written to AUX[0Eh] will
be one of the following: 1Ch, 1Dh, 1Eh, or 1Fh. This selects the Red LUT only, indexes C, D, E and F.
Write LUT entry value to Look-Up Table Data Register AUX[0Fh].
For a linear LUT, use the Look-Up table entries in Table 3-9, “S1D13503 Low To High Intensity Color Look-Up Ta-
ble For 4 Colors,” on page 28.
Repeat steps 2 and 3 until all 4 LUT entries have been written.
To display data using Red Bank 3 write 11b to AUX[0F] bits 7,6:
AUX[0Fh] = original AUX[0Fh] ‘OR’ 1100 0000b
In 4 color mode, program red bank 3 LUT entries and select for use.
Table 3-9: S1D13503 Low To High Intensity Color Look-Up Table For 4 Colors
start of bank index
start of bank 3
Index
(hex)
D
C
E
F
=
=
bank number
3 4
=
Look-Up
12
Table
(hex)
A
F
0
5
=
0Ch
4
Epson Research and Development
Programming Notes and Examples
Vancouver Design Center
Issue Date: 01/01/30