16-Bit Color Palette Register; Table 13-32. Palette Register; Table 13-33. Palette Register Use For Tft And Stn - Sharp Blue Treak LH75400 User Manual

LH75400/01/10/11 (Preliminary) User's Guide
13.3.2.12 256 × 16-bit Color Palette Register
The color map in the SoC of 65,535 colors is mapped into a group of palette entries, com-
prising the Palette Registers. The upper four bits of each palette entry is used for best con-
trast in STN displays. The palette is organized as seen in Table 13-32.
The Palette Registers contain 256 palette entries organized as 128 locations of two 16-bit
entries per word, forming a 32-bit word. TFT and STN displays use 12 of the palette entry
bits, yielding 3,375 colors of the total 32,768 colors. Each word location contains two pal-
ette entries. This means that 128 word locations are used for the palette. The color that is
displayed is based on the setting of bit [8] of the Control Register (see Section 13.4.5.2).
Due to the hardware requirements of STN displays, each palette entry is shifted left by one
bit. For TFT displays, bits 3:0 of the palettes are used. For color STN displays, bits [4:1] of
the red, blue and green palettes are used. For monochrome STN displays, only the red
palette bits [4:1] are used. Note that the palettes are accessed 32 bits at a time.
BIT
FIELD
RESET
RW
BIT
FIELD
RESET
RW
ADDR

Table 13-32. Palette Register

31 30 29 28 27
/// BLUE PALETTE
RW RW RW RW RW
15 14 13 12 11
/// BLUE PALETTE
RW RW RW RW RW

Table 13-33. Palette Register Use for TFT and STN

BIT (TFT)
31:30
29:26
25
24:21
20
19:16
15:14
13:10
9
8:5
4
3:0
NOTE: Blue and red palette data can swap places, depending on
the setting of bit [8] of the LCD Control Register
(see Section 13.3.2.8).
Color Liquid Crystal Display Controller
26 25 24 23
GREEN PALETTE
RW RW RW RW
10 9 8 7
GREEN PALETTE
RW RW RW RW
0xFFFF4000 + 0x200 to 0xFFFF4000 + 0x3FC
BIT (STN) NAME
31 /// Unused
30:27 B[3:0] Blue palette data
26 /// Unused
25:22 G[3:0] Green palette data
21 /// Unused
20:17 R[3:0] Red palette data
16:15 /// Unused
14:11 B[3:0] Blue palette data
10 /// Unused
9:6 G[3:0] Green palette data
5 /// Unused
4:1 R[3:0] Red palette data
0 /// Unused
7/15/03
22 21 20 19 18
RED PALETTE
RW RW RW RW RW
6 5 4 3 2
RED PALETTE
RW RW RW RW RW
DESCRIPTION
17 16
RW RW
1 0
RW RW
13-23