S1D13503 Epson Electronics America, Inc., S1D13503 Datasheet - Page 144

• Manufacturer Part Number: S1D13503
• Description: S1d13503 Graphics Lcd Controller
• Manufacturer: Epson Electronics America, Inc.

Page 48
5.4.3 Dual Panel LCD
S1D13503
X18A-G-002-06
9.
The following is the procedure to show a split screen image on a 4 gray shade 640 x 480 dual panel LCD. For this example
the S5U13503B00C is used with the Memory Interface set to 16 bits (required for 128k of display memory). In addition,
the two images shown on the split screen are each 640 x 240.
1.
2.
3.
4.
5.
•
Write both image 1 and image 2 to their respective locations in display memory.
Determine whether the Display Start Address Registers refer to bytes or words.
Since the Memory Interface is set to 16 bits, the Display Start Address Registers refer to words. Note that when ad-
dresses refer to words, the image must be aligned in memory such that the beginning is found on a word boundary
(the least significant bit of the memory address must be 0).
Calculate the number of bytes per scan line.
Determine the display memory location for image 1.
For simplicity, assign the beginning of display memory as the starting address of image 1 (see Figure 16). For the
S5U13503B00C, this address is D000:0000h, bank 0.
Program the Screen 1 Display Start Address Register to point to the beginning of image 1.
Since image 1 is at the beginning of display memory, program the Screen 1 Display Start Address Register to 0000h.
AUX[06h] = 00h
AUX[07h] = 00h
Calculate the total number of bytes required for image 1.
4 gray shades => 2 bits per pixel
2 bits per pixel => 4 pixels per byte
number of bytes per scan line
If the line count is set to 99, then the first 100 scan lines of image 1 are shown, following by the first part of im-
age 2 (see Figure 17).
AUX[0Ah] = 63h (99 decimal)
AUX[0Bh] = 00h
bytes per scan line
Figure 17: 320 x 240 Single Panel For Split Screen
=
number of scan lines for image 1
pixels per scan line
--------------------------------------------- -
Screen 1 Display Line Count Register = 99 lines
pixels per byte
Scan Line 100
Scan Line 239
Scan Line 99
Scan Line 0
...
...
=
640
-------- -
4
=
160 bytes per scan line
=
160 240
Image 1
Image 2
=
38400 bytes
Epson Research and Development
Programming Notes and Examples
=
00A0h bytes per scan line
=
Vancouver Design Center
9600h bytes
Issue Date: 01/01/30