a-Si TFT LCD Single Chip Driver
240RGBx320 Resolution and 262K color
ILI9325
7.5.3. Moving Picture Mode
ILI9325 has the RGB interface to display moving picture and incorporates GRAM to store display data, which
has following merits in displaying a moving picture.
• The window address function defined the update area of GRAM.
• Only the moving picture area of GRAM is updated.
• When display the moving picture in RGB interface mode, the DB[17:0] can be switched as system
interface to update still picture area and registers, such as icons.
RAM access via a system interface in RGB-I/F mode
ILI9325 allows GRAM access via the system interface in RGB interface mode. In RGB interface mode, data
are written to the internal GRAM in synchronization with DOTCLK and ENABLE signals. When write data to
the internal GRAM by the system interface, set ENABLE to terminate the RGB interface and switch to the
system interface to update the registers (RM = “0”) and the still picture of GRAM. When restart RAM access in
RGB interface mode, wait one read/write cycle and then set RM = “1” and the index register to R22h to start
accessing RAM via the RGB interface. If RAM accesses via two interfaces conflicts, there is no guarantee that
data are written to the internal GRAM.
The following figure illustrates the operation of the ILI9325 when displaying a moving picture via the RGB
interface and rewriting the still picture RAM area via the system interface.
Still Picture Area
Moving
Picture Area
Update
a frame
Update a
frame
VSYNC
ENABLE
DOTCLK
DB[17:0]
Update
Update
moving
picture
area
moving
picture
area
Set
IR to
R22h
Set
IR to
R22h
Update display data in
other than the moving
picture area
Set
IR to
R22h
Set
RM=0
Set
AD[15:0]
Set
AD[15:0]
Set
RM=1
Figure18 Example of update the still and moving picture
The information contained herein is the exclusive property of ILI Technology Corp. and shall not be distributed,
reproduced, or disclosed in whole or in part without prior written permission of ILI Technology Corp.
Page 42 of 111
Version: 0.35
ETC [ ETC ]
