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Epson Research and Development Page 181
Vancouver Design Center
Hardware Functional Specification S1D13708
Issue Date: 02/03/07 X39A-A-001-02
12.3 180° SwivelView™
The following figure shows how the programmer sees a 480x320 landscape image and how
the image is being displayed. The application image is written to the S1D13708 in the
following sense: A–B–C–D. The display is refreshed by the S1D13708 in the following
sense: D-C-B-A.
Figure 12-2 Relationship Between The Screen Image and the Image Refreshed in 180° SwivelView.
12.3.1 Register Programming
Enable
180°
SwivelView™ Mode
Set SwivelView™ Mode Select bits to 10.
Display Start Address
The display refresh circuitry starts at pixel “D”, therefore the Display Start Address register
must be programmed with the address of pixel “D”. The example in the figure shows a 480-
pixel wide display, and if we assume 8-bpp display mode, the Display Start Address will
be 95FFh (the Display Start Address register is 0-based and in 32-bit increment).
Memory Address Offset
The Memory Address Offset register should be normally set to be the same as the display
width, e.g. 480 pixels or 78h (the Memory Address Offset register is in 32-bit increment).
This value may be increased to create a virtual display.
image seen by programmer
= image in display buffer
480
SwivelView
window
480
320
AB
CD
320
image refreshed by S1D13708
SwivelView
window
AB
CD
display start address
(panel origin)
physical memory
start address