Motorola MPC823e Reference Manual page 1033

LCD Controller
18.4.7.5 ACTIVE FOUR AND EIGHT BITS PER PIXEL COLOR MODE. This mode
operates the same way for 4- or 8-bits per pixel and the color RAM is loaded similarly. You
provide a 4- or 8- bit data word that the DMA controller retrieves from display memory and
that value is indexed into the color RAM as shown below. For 4-bits per pixel mode, you can
choose one of 16 out of a total of 4,096 possible colors. For 8-bits per pixel mode, you can
choose one of 256 out of the 4,096 possible colors. See Figure 18-9 for more information.
For active (TFT) panels, each bit of data for each red, green, or blue value read from the
color RAM is passed directly to the LCD data bus. These bits follow a particular sequence—
LD0 (MSB), LD1, LD2, LCD_A, LD3, LD4, LD5, LCD_B, LD6, LD7, LD8, and LCD_C (LSB).
BIT 0 1 2
FIELD RESERVED
RESET —
R/W
ADDR
(IMMR & 0xFFFF0000) +
NOTE: — = Undefined.
Bits 0–3, 7, 11, and 15—Reserved
These bits are reserved and must be set to 0.
R—Red Level
This field is a 4-bit code that represents the red color level and is passed directly to the LCD
interface.
G—Green Level
This field is a 4-bit code that represents the green color level and is passed directly to the
LCD interface
B—Blue Level
This field is a 4-bit code that represents the blue color level and is passed directly to the LCD
interface
18-36
3 4 5 6 7
R
—
(DPR) E00— E1F (4-BIT) OR
0x 0x
MPC823e REFERENCE MANUAL
8 9 10 11 12
G
—
E00— FFF (8-BIT)
0x 0x
13 14 15
B
—
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