Hardware Rotation; Introduction To Hardware Rotation; S1D13505 Hardware Rotation - Epson S1D13505F00A Technical Manual

8 H
ARDWARE

8.1 Introduction to Hardware Rotation

Most computer displays operate in landscape mode. In landscape mode the display is wider than it is
high. For instance, a standard display size is 640x480 where the width is 640 pixels and the height is
480 pixels.
Portrait mode rotates the display image clockwise ninety degrees, resulting in a display that is taller
than it is wide. Placing the 640x480 display in portrait mode will yield a display that is now 480 pix-
els wide and 640 pixels high.

8.2 S1D13505 Hardware Rotation

The S1D13505 provides hardware support for portrait mode output in 16 and 8 bpp modes.
The switch to portrait mode carries several conditions:
• The (virtual) display offset must be set to 1024 pixels.
• The display start address is calculated differently in portrait mode.
• Calculations that would result in panning in portrait mode result in scrolling in portrait mode and
vice-versa.
S1D13505 PROGRAMMING NOTES
AND EXAMPLES (X23A-G-003-05)
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R
OTATION
EPSON

8: HARDWARE ROTATION

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