a-Si TFT LCD Single Chip Driver
240RGBx320 Resolution and 262K color
ILI9325
7. System Interface
7.1. Interface Specifications
ILI9325 has the system interface to read/write the control registers and display graphics memory (GRAM),
and the RGB Input Interface for displaying a moving picture. User can select an optimum interface to display
the moving or still picture with efficient data transfer. All display data are stored in the GRAM to reduce the
data transfer efforts and only the updating data is necessary to be transferred. User can only update a
sub-range of GRAM by using the window address function.
ILI9325 also has the RGB interface and VSYNC interface to transfer the display data without flicker the
moving picture on the screen. In RGB interface mode, the display data is written into the GRAM through the
control signals of ENABLE, VSYNC, HSYNC, DOTCLK and data bus DB[17:0].
In VSYNC interface mode, the internal display timing is synchronized with the frame synchronization signal
(VSYNC). The VSYNC interface mode enables to display the moving picture display through the system
interface. In this case, there are some constraints of speed and method to write data to the internal RAM.
ILI9325 operates in one of the following 4 modes. The display mode can be switched by the control register.
When switching from one mode to another, refer to the sequences mentioned in the sections of RGB and
VSYNC interfaces.
Operation Mode
RAM Access Setting
(RM)
Display Operation Mode
(DM[1:0])
Internal operating clock only
(Displaying still pictures)
System interface
(RM = 0)
Internal operating clock
(DM[1:0] = 00)
RGB interface (1)
(Displaying moving pictures)
RGB interface
(RM = 1)
RGB interface
(DM[1:0] = 01)
RGB interface (2)
(Rewriting still pictures while
displaying moving pictures)
System interface
(RM = 0)
RGB interface
(DM[1:0] = 01)
VSYNC interface
(Displaying moving pictures)
System interface
(RM = 0)
VSYNC interface
(DM[1:0] = 01)
Note 1) Registers are set only via the system interface.
Note 2) The RGB-I/F and the VSYNC-I/F are not available simultaneously.
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 24 of 111
Version: 0.35
ETC [ ETC ]
