Motorola MPC823e Reference Manual page 1032

18.4.7.4 PASSIVE 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 colors from the 4,096 possible colors. For 8-bits per pixel mode, you can
choose one of 256 colors from the 4,096 possible colors. See Figure 18-9 for more
information.
BIT 0 1 2
FIELD RESERVED
RESET —
R/W R/W
ADDR
(IMMR &
NOTE: — = Undefined.
Bits 0–3—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. The frame rate control dictates
when this color pixel is on or off.
G—Green Level
This field is a 4-bit code that represents the green color level. The frame rate control dictates
when this color pixel is on or off.
B—Blue Level
This field is a 4-bit code that represents the blue color level. The frame rate control dictates
when this color pixel is on or off.
MOTOROLA
3 4 5 6 7
R
—
R/W
0x (DPR) 0xE00—0xE1F (4-BIT) OR 0xE00—0xFFF (8-BIT)
FFFF0000) +
MPC823e REFERENCE MANUAL
8 9 10 11 12 13
G
—
R/W
LCD Controller
14 15
B
—
R/W
18-35