SED1374 Datasheet, PDF (73/420 Pages) Epson Company – SED1374 Embedded Memory Color LCD Controller

Epson Research and Development
Vancouver Design Center
Page 65
REG[15h] Look-Up Table Address Register
Address = FFF5h
n/a
n/a
RGB Index
Bit 1
RGB Index
Bit 0
Look-Up
Table
Address
Bit 3
Look-Up
Table
Address
Bit 2
Look-Up
Table
Address
Bit 1
Read/Write
Look-Up
Table
Address
Bit 0
bits 5-4
bits 3-0
The SED1374 has three 16-position, 4-bit wide Look-Up Tables, one each for red, green,
and blue. Refer to “Look-Up Table Architecture” for details. This register selects which
Look-Up Table position is read/write accessible through the Look-Up Table Data Register
(REG[17h]).
RGB Index Bits [1:0]
These bits select between the Red, Green, and Blue Look-Up Tables, and Auto-Increment
mode. The Green Look-Up Table is used in monochrome mode with these bits set to 10b.
See Note below.
Look-Up Table Address Bits [3:0]
These 4 bits select one of the 16 positions in the selected Look-Up Table. These bits are
automatically changed as the Look-Up Table Data Register is accessed. See Note below.
Note
Accesses to the Look-Up Table Data Register automatically increment a pointer into the
RGB Look-Up Tables. The pointer sequence varies as shown in the table below.
Table 8-7: Look-Up Table Access
REG[01h]
bit 5
0
1
1
1
1
REG[15h]
bit 5
bit 4
1
0
0
0
0
1
1
0
1
1
Look-Up Table
Selected
Green/Gray Look-
Up Table
Auto-Increment
Red Look-Up Table
Green/Gray Look-
Up Table
Blue Look-Up Table
Pointer Sequence
G[n], G[n+1], G[n+2],...
R[n], G[n], B[n], R[n+1], G[n+1],...
R[n], R[n+1], R[n+2],...
G[n], G[n+1], G[n+2],...
B[n], B[n+1], B[n+2],...
In Auto-Increment mode, writing the Look-Up Table Address Register automatically
sets the pointer to the Red Look-Up Table. For example, writing a value 03 into the
Look-Up Table Address Register selects Auto-Increment mode and sets the pointer to
R[3]. Subsequent accesses to the Look-Up Table Data Register move the pointer onto
G[3], B[3], R[4], etc.
Hardware Functional Specification
Issue Date: 99/04/29
SED1374
X26A-A-001-02