S1D13503 Epson Electronics America, Inc., S1D13503 Datasheet - Page 146

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

Page 50
S1D13503
X18A-G-002-06
Each image can be scrolled or panned by appropriate programming of the respective Display Start Address Registers. The
following are some examples:
•
•
•
•
5.4.3.1 Displaying a Single Image on a Dual Panel
The following is the procedure to show a single image on a dual panel LCD. In this procedure the single image is broken
into two smaller images; the first half of the image is placed on the top panel and the second half is placed on the bottom
panel. For this example the S5U13503B00C is used with a 4 gray shade 640 x 480 dual panel LCD; the Memory Interface
is set to 16 bits to support 128k of display memory.
1.
2.
To scroll image 1 up, the Screen 1 Start Address Register must point to the following scan line.
AUX[06h] = LSB of Screen 1 Display Start Address
AUX[07h] = MSB of Screen 1 Display Start Address
To scroll image 2 down, the Screen 2 Start Address Register must point to the previous scan line.
AUX[08h] = LSB of Screen 2 Display Start Address
AUX[09h] = MSB of Screen 2 Display Start Address
To pan image 1 to the right by a group of pixels, the Screen 1 Start Address Register must be increased by 1.
AUX[06h] = LSB of Screen 1 Display Start Address
AUX[07h] = MSB of Screen 1 Display Start Address
See Section 5.5.2, “Panning Right and Left” on page 52 for more information.
To pan image 2 to the left by a group of pixels, the Screen 2 Start Address Register must be decreased by 1.
AUX[08h] = LSB of Screen 2 Display Start Address
AUX[09h] = MSB of Screen 2 Display Start Address
See Section 5.5.2, “Panning Right and Left” on page 52 for more information.
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.
4 gray shades => 2 bits per pixel
2 bits per pixel => 4 pixels per byte
number of bytes per scan line
Screen 1 Display Start Address
Screen 2 Display Start Address
Screen 1 Display Start Address
Screen 2 Display Start Address
=
pixels per scan line
--------------------------------------------- -
pixels per byte
=
=
Screen 1 Display Start Address
Screen 2 Display Start Address
=
=
=
640
-------- -
4
Screen 1 Display Start Address
Screen 2 Display Start Address 1
=
160 bytes per scan line
+
–
number of bytes per scan line
----------------------------------------------------------------------
number of bytes per scan line
----------------------------------------------------------------------
Epson Research and Development
2 bytes per word
2 bytes per word
Programming Notes and Examples
=
+
–
00A0h bytes per scan line
1
Vancouver Design Center
Issue Date: 01/01/30