Motorola MPC823e Reference Manual page 1035

SECTION 19
VIDEO CONTROLLER
The MPC823e contains an on-chip video controller that can be used to drive a digital TFT
LCD panel or an analog NTSC/PAL display (which needs an external video encoder). It uses
the same I/O pins as the LCD controller, which means you can only be using one or the other
at a time. The video controller has features that give you more flexibility when preparing data
for a video display.
The video controller uses a frame buffer, also called a display buffer, that is stored in system
memory. The data in the display buffer represents pixel components (bytes), whether it is
RGB or YC C . You are responsible for preprocessing data as it is stored in the display
r b
buffer. The video controller uses a dedicated DMA channel to read the data from the display
buffer and drive it to the video interface. It also generates the required timing and control
signals (horizontal sync, vertical sync, field, and blanking). A typical MPC823e video system
is illustrated in Figure 19-1.
MPC823e
FRAME
BUFFER
SYSTEM RAM
SYSTEM
INTERNAL BUS
SYSTEM BUS
CORE
INTERFACE
UNIT
LCD TFT
PANEL
IRQ
DIGITAL
CRT
VIDEO
VIDEO
DMA
PANEL
CONTROLLER
ENCODER
Figure 19-1. Typical MPC823e Video System
MOTOROLA MPC823e REFERENCE MANUAL 19-1