sed1355 ETC-unknow, sed1355 Datasheet - Page 186

• Manufacturer Part Number: sed1355
• Description: Sed1355 Embedded Ramdac Lcd/crt Controller
• Manufacturer: ETC-unknow

Page 30
5.3.2 Examples
SED1355
X23A-G-003-05
Example 6: Display 380 scanlines of image 1 and 100 scanlines of image 2. Image 2 is locat-
1.
2. Screen 1 is coming from offset 0 in the display buffer. Although not necessary, ensure that the
3.
4.
The value for the line compare is not dependent on any other setting so we can set it immedi-
ately (380 = 17Ch).
Write the line compare registers [0Fh] with 01h and register [0Eh] with 7Ch.
screen 1 start address is set to zero.
Write 00h to registers [10h], [11h] and [12h].
Calculate the size of the screen 1 image (so we know where the screen 2 image is located).
This calculation must be performed on the virtual size (offset register) of the display. Since a
virtual size was not specified assume the virtual size to be the same as the physical size.
offset = pixels_per_line / pixels_per_word = 640 / 16 = 40 words per line
screen1_size = offset * lines = 40 * 480 = 19,200 words = 4B00h words
Set the screen 2 start address to the value we just calculated.
Write the screen 2 start address registers [15h], [14h] and [13h] with the values 00h, 4Bh and
00h respectively.
ed immediately after image 1 in the display buffer. Assume a 640x480 display
and a color depth of 1 bpp.
Epson Research and Development
Programming Notes and Examples
Vancouver Design Center
Issue Date: 99/04/27