SSD1789A Solomon Systech, SSD1789A Datasheet - Page 22

• Manufacturer Part Number: SSD1789A
• Description: CSTN LCD Driver
• Manufacturer: Solomon Systech

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7.3
This module determines whether the input data is interpreted as data or command. Data is directed to this module based
upon the input of the
input at D7 – D0 is interpreted as a Command and it will be decoded. The decoded command will be written to the
corresponding command register.
7.4
The GDDRAM is a bit mapped static RAM holding the bit pattern to be displayed. The size of the RAM is 396 (132 RGB) x
132 x 18 = 313632 bits. Figure 4 on page 23 is a description of the GDDRAM address map.
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” in Table 6 on page 26 for detail description.
Four pages of display data form 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” in Table 13 on page 41.
Solomon Systech
Command Decoder
Graphic Display Data RAM (GDDRAM)
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D/
C
pin. If
D/
C
pin is high, data is written to Graphic Display data RAM (GDDRAM). If it is low, the
Jul 2004
P 22/69 Rev 1.0
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