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Page 52
S1D13706
X31B-G-003-03
2. Confirm the sub-window coordinates are valid.
The horizontal coordinates and horizontal width must be a multiple of 32 ÷ bpp.
60 ÷ (32 ³ 4) = 7.5 (invalid)
120 ÷ (32 ÷ 4) = 15
The sub-window horizontal start coordinate is invalid. Therefore, a valid coordinate
close to 60 must be chosen. For example, 8 × (32 ÷ 4) = 64. Consequently the new
sub-window coordinates are (64, 80).
3. 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 height × bpp ÷ 8)) ÷ 4) - 1
= ((0 + (240 × 4 ÷ 8) ÷ 4) - 1
= 29
= 1Dh
Program the Main Window Display Start Address registers. REG[74h] is set to 1Dh,
REG[75h] is set to 00h, and REG[76h] is set to 00h.
4. Determine the main window line address offset.
number of dwords per line
Program the Main Window Line Address Offset register. REG[78h] is set to 1Eh, and
REG[79h] is set to 00h.
5. Determine the sub-window display start address.
The main window image must take up 320 x 240 pixels ÷ 2 pixels per byte= 9600h
bytes. If the main window starts at address 0h, then the sub-window can start at
9600h.
sub-window display start address register
= ((desired byte address + (sub-window width × bpp ÷ 8)) ÷ 4) - 1
= ((9600h + (120 × 4 ÷ 8)) ÷ 4) - 1
= 9614
= 258Eh
Program the Sub-window Display Start Address register. REG[7Ch] is set to 8Eh,
REG[7Dh] is set to 25h, and REG[7Eh] is set to 00h.
6. Determine the sub-window line address offset.
number of dwords per line
Epson Research and Development
Vancouver Design Center
= image width ÷ (32 ÷ bpp)
= 240 ÷ (32 ÷ 4)
= 30
= 1Eh
= image width ÷ (32 ÷ bpp)
Programming Notes and Examples
Issue Date: 01/02/23
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