S1D13503 Epson Electronics America, Inc., S1D13503 Datasheet - Page 142

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

Page 46
5.4.2 Single Panel LCD
S1D13503
X18A-G-002-06
The following is the procedure to show a split screen image on a 16 color 320 x 240 single 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 320 x 240; only a portion of each image is shown.
1.
2.
3.
4.
5.
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.
16 colors => 4 bits per pixel
4 bits per pixel => 2 pixels per byte
number of bytes per scan line
bytes per scan line
Screen 1 Display Start Address
Screen 2 Display Start Address
=
number of scan lines for image 1
pixels per scan line
--------------------------------------------- -
D000:0000h, bank 0
D000:9600h, bank 0
(for this example)
Figure 16: Memory Map For Split Screen
pixels per byte
=
320
-------- -
2
=
160 bytes per scan line
=
160 240
Display Memory
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