SSD1298 Crystalfontz America, Inc.,, SSD1298 Datasheet - Page 26

• Manufacturer Part Number: SSD1298
• Description: 240 Rgb X 320 Tft Lcd Controller Driver Integrated Power Circuit, Gate And Source Driver With Built-in Ram
• Manufacturer: Crystalfontz America, Inc.,

6.2
6.3
6.4
6.5
Solomon Systech
CSB
SDC
SCK
SDI
Address Counter (AC)
Graphic Display Data RAM (GDDRAM)
Gamma/Grayscale Voltage Generator
Transfer starts
RGB Interface
SSD1298 supports RGB interface. RGB interface unit consists of D[17:0], HSYNC, VSYNC,
DOTCLK and OE signals for display moving pictures. When the RGB interface is selected, the
display operation is synchronized with external control signals (HSYNC, VSYNC and DOTCLK).
Data is written in synchronization with the control signals when DEN is enabled for write operation
in order to avoid flicker or tearing effect while updating display data.
The address counter (AC) assigns address to the GDDRAM. When an address set instruction is
written into the IR, the address information is sent from the IR to the AC.
After writing into the GRAM, the AC is automatically incremented by 1 (or decremented by 1). After
reading the data, the AC is not updated. A window address function allows for data to be written only
to a window area specified by GRAM.
The GDDRAM is a bit mapped static RAM holding the bit pattern to be displayed. The size of the
RAM is 240 RGB x 320 x 18 / 8 = 172,800 bytes. For mechanical flexibility, re-mapping on both
Segment and Common outputs can be selected by software. Please refer to the command “Data
Output/Scan direction” for detail description.
Four pages of display data forms a RAM address block and stored in the GDDRAM. Each block will
form the fundamental units of scrolling addresses. Various types of area scrolling can be performed
by software program according to the command “Set area Scroll” and “Set Scroll Start”.
The grayscale voltage circuit generates a LCD driver circuit that corresponds to the grayscale levels
as specified in the grayscale gamma adjustment resister. 262,144 possible colors can be displayed
when 1 pixel = 18 bit. For details, see the gamma adjustment register.
MSB
DB
7
1
DB
6
2
Register
DB
5
3
DB
4
4
DB
5
3
Figure 6-3: 4-wire SPI interface (8 bits)
DB
6
2
DB
7
1
Transfer
LSB
8
DB
0
Transfer starts
Mar 2008 P 26/82
MSB
DB
1
7
DB
2
6
DB
3
5
Data
DB
4
4
DB
5
3
Rev 1.1
DB
6
2
DB
7
1
Transfer
LSB
DB
8
0
SSD1298