SED1354 Datasheet, PDF (126/472 Pages) Epson Company – Color Graphics LCD/CRT Controller

Page 118
Epson Research and Development
Vancouver Design Center
10.2 Image Manipulation
The figure below shows how screen 1 and screen 2 images stored in the image buffer are positioned
on the display. The screen 1 and screen 2 images can be parts of a larger virtual image or images.
• (REG[17h], REG[16h]) defines the width of the virtual image(s).
• (REG[12h], REG[11h], REG[10h]) defines the starting word of the screen 1,
(REG[15h], REG[14h], REG[13h]) defines the starting word of the screen 2.
• REG[18h] bits [3:0] define the starting pixel within the starting word for screen 1,
REG[18h] bits[7:4] define the starting pixel within the starting word for screen 2.
• (REG[0Fh],REG[0Eh]) define the last line of screen 1, the remainder of the display is taken up
by screen 2.
Image Buffer
(REG[12h], REG[11h], REG[10h])
REG[18h] bits [3:0]
Display
Screen 1
(REG[15h], REG[14h], REG[13h])
REG[18h] bits [7:4]
Screen 2
Line 0
Line 1
((REG[09h], REG[08h])+1) lines
Screen 1
Line (REG[0Fh], REG[0Eh])
Screen 2
((REG[04h]+1)*8) pixels
(REG[17h], REG[16h])
Figure 10-3: Image Manipulation
SED1354
X19A-A-002-16
Hardware Functional Specification
Issue Date: 99/05/18