LCD Controller
MOTOROLA MPC823e REFERENCE MANUAL 18-35
LCD CONTROLLER
18
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.
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.
BIT 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
FIELD RESERVED R G B
RESET ————
R/W R/W R/W R/W R/W
ADDR
(IMMR &
0x
FFFF0000) +
(DPR) 0xE00—0xE1F (4-BIT) OR 0xE00—0xFFF (8-BIT)
NOTE: — = Undefined.
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