Limitations; Swivelview 0° And 180; Swivelview 90° And 270 - Epson S1D13706 Technical Manual

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7.3 Limitations

7.3.1 SwivelView 0° and 180°
7.3.2 SwivelView 90° and 270°
S1D13706
X31B-G-003-03
2. Determine the main window display start address.
The main window is typically placed at the start of display memory, which is at dis-
play address 0.
main window display start address register
= (desired byte address + ((panel width - 1) × panel height × bpp ÷ 8) ÷ 4)
= (0 + ((320 - 1) × 240 × 4 ÷ 8) ÷ 4)
= 9570
= 2562h
Program the Main Window Display Start Address registers. REG[74h] is set to 62h,
REG[75h] is set to 25h, and REG[76h] is set to 00h.
3. Determine the main window line address offset.
number of dwords per line
Program the Main Window Line Address Offset registers. REG[78h] is set to 1Eh,
and REG[79h] is set to 00h.
In SwivelView 0° and 180°, the main window line address offset register requires the panel
width to be a multiple of 32 ÷ bits-per-pixel. If this is not the case, then the main window
line address offset register must be programmed to a longer line which is a multiple of 32
÷ bits-per-pixel. This longer line creates a virtual image where the width is main window
line address offset register × 32 ÷ bits-per-pixel and the main window image must be drawn
right-justified to this virtual width.
In SwivelView 90° and 270°, the main window line address offset register requires the
panel height to be a multiple of 32 ÷ bits-per-pixel. If this is not the case, then the main
window line address offset register must be programmed to a longer line which is a multiple
of 32 ÷ bits-per-pixel. This longer line creates a virtual image whose width is main window
line address offset register × 32 ÷ bits-per-pixel and the main window image must be drawn
right-justified to this virtual width.
Epson Research and Development
Vancouver Design Center
= image width ÷ (32 ÷ bpp)
= 240 ÷ (32 ÷ 4)
= 30
= 1Eh
Programming Notes and Examples
Issue Date: 01/02/23