ra8835a RAIO Technology Inc., ra8835a Datasheet - Page 47

• Manufacturer Part Number: ra8835a
• Description: Dot Matrix Lcd Controller
• Manufacturer: RAIO Technology Inc.

RAiO TECHNOLOGY INC.
Version 1.0
7-12 Memory to Display Relationship
The RA8835A series supports virtual screens that are larger than the physical size of the LCD panel
address range, C/R. A layer of the RA8835A series can be considered as a window in the larger
virtual screen held in display memory. This window can be divided into two blocks, with each block
able to display a different portion of the virtual screen.
This enables, for example, one block to dynamically scroll through a data area while the other acts as
a status message display area. See Figure 7-20 and 7-21.
SAD1
SAD2
Layer 1
SAD3
SAD2
SAD1
Display page1
SAD3
Display page2
W/S=0
Layer 2
Layer 2
Layer 1
Layer 1
Display page 1
Display page 2
Display page1
Display page3
Display page2
Display page3
Layer 2 Layer 3
Figure 7-20: Display Layers and Memory
SAD3
SAD1
SAD3
SAD3
SAD1
Graphics page 3
Character page1
Character page3
Character page3
SAD2
SAD2
C/R
C/R
C/R
47/88
Character page1
Graphics page 2
Graphics page 2
SAD1
Graphics page 2
C/R
C/R
C/R
Graphics page 2
AP
Graphics page 1
CG RAM
C/R
C/R
SAD1
SAD3
SAD2
SAD4
W/S=1
Dot Matrix LCD Controller
Graphics page 1
Graphics page 2
Graphics page 3
Graphics page 4
Layer 2
Layer 1
RA8835A
www.raio.com.tw