Epson S1D13506 Technical Manual page 208

Page 202
S1D13506
X25B-A-001-12
LCD/CRT Memory Address Offset (words)
= 1024
= 512
Display Start Address
As seen in Figure 15-1: "Relationship Between Screen Image and 90° Rotated Image in the
Display Buffer," on page 201, the Display Start Address is determined by the location of
the image corner "C", and it is generally non-zero. The LCD/CRT Display Start Address
register (REG[042h], REG[043h], REG[044h] for LCD, or REG[062h], REG[063h],
REG[064h] for CRT) must be set accordingly.
LCD/CRT Display Start Address (words)
= (1024 - W)
= (1024 - W) / 2
where W is the width of the panel in number of pixels.
Horizontal Panning
Horizontal panning is achieved by changing the LCD/CRT Display Start Address register:
• Increase/decrease LCD/CRT Display Start Address register by 1024 (15/16 bpp mode)
or 512 (8 bpp mode) pans the display window to the right/left by 1 pixel.
The amount the display window can be panned to the right is limited to 1024 pixels and
limited by the amount of physical memory installed.
Vertical Scrolling
Vertical scrolling is achieved by changing the LCD/CRT Display Start Address register
and/or the LCD/CRT Pixel Panning register:
• Increment/decrement LCD/CRT Display Start Address register in 8 bpp mode scrolls
the display window up/down by 2 lines.
• Increment/decrement LCD/CRT Display Start Address register in 15/16 bpp mode
scrolls the display window up/down by 1 line.
• Increment/decrement LCD/CRT Pixel Panning register in 8 bpp mode scrolls the
display window up/down by 1 line.
Epson Research and Development
for 15/16 bpp mode
for 8 bpp mode
for 15/16 bpp mode
for 8 bpp mode
Hardware Functional Specification
Vancouver Design Center
Issue Date: 02/03/26