
Epson Research and Development
Page 27
Vancouver Design Center
Programming Notes and Examples
SED1352
Issue Date: 98/10/08
X16-BG-007-04
4.3 Common Display Memory Requirements for LCD Panel Sizes
The following is a list of memory requirements and memory maps for common LCD resolutions. Note that the memory
required for 640x480 with 16 gray shades exceeds 128k and is therefore not supported on the SED1352.
Figure 6: Memory Map Example for 320 x 240 LCD Panel with 4 Gray Shades
Figure 7: Memory Map Example for 640 x 200 LCD Panel with 16 Gray Shades
Table 4-1: Memory Size Requirements
Display
Resolution
Pixel Storage
Memory Requirements
Bits/Pixel
Gray Shades
Bytes
Hex
320x240
2
4
19,200
0000 4B00
4
16
38,400
0000 9600
640x200
2
4
32,000
0000 7D00
4
16
64,000
0000 FA00
640x480
2
4
76,800
0001 2C00
4
16
N/A
N/A
Offset
(hex)
Offset
(hex)
0000
Scan Line 0
004F
0050
Scan Line 1
009F
4A60
Scan Line 238
4AAF
4AB0
Scan Line 239
4AFF
Offset
(hex)
Offset
(hex)
0000
Scan Line 0
013F
0140
Scan Line 1
027F
F780
Scan Line 198
F8BF
F8C0
Scan Line 199
F9FF