mpc823rg Freescale Semiconductor, Inc, mpc823rg Datasheet - Page 1024

• Manufacturer Part Number: mpc823rg
• Description: Mpc823 Powerquicc Integrated Communications Processor For Portable Systems
• Manufacturer: Freescale Semiconductor, Inc

LCD Controller
18.4.7.3 FOUR BITS PER PIXEL GRAYSCALE MODE. In 4-bits per pixel grayscale
mode, the LCD controller provides 16 possible shades to be loaded into each pixel of the
LCD panel. The four bits of data are provided by each display memory word that is accessed
by the DMA controller. This value will then index into the first 16 odd addresses of the color
RAM. You can provide any of the 16 possible shades by loading the color RAM addresses
shown below. See Figure 18-8 for more information.
Bits 0–7—Reserved
These bits are reserved and must be set to 0.
GLCA/GLCB—Grayscale Level Code A and B
This field is a 4-bit code that represents any one of 16 possible grayscale levels for a given
pixel code. This grayscale level is then used to represent the appropriate shade for a given
pixel and is passed to the appropriate panel bit. GLCA and GLCB must be programmed to
the same value. The color RAM to be programmed is shown below.
NOTE: — = Undefined.
RESET
FIELD
ADDR
R/W
BIT
0
1
2
Freescale Semiconductor, Inc.
RESERVED
For More Information On This Product,
3
R/W
—
MPC823 REFERENCE MANUAL
4
(IMMR &0xFFFF0000) + (DPR) 0xE00—0xFFF
Go to: www.freescale.com
5
6
7
8
9
GLCB
R/W
—
10
11
12
13
GLCA
R/W
—
MOTOROLA
14
15