S1D13704 Epson Electronics America, Inc., S1D13704 Datasheet - Page 141

• Manufacturer Part Number: S1D13704
• Description: LCD Controller
• Manufacturer: Epson Electronics America, Inc.

Epson Research and Development
Vancouver Design Center
Programming Notes and Examples
Issue Date: 01/02/12
Example 8: Pan the above SwivelView mode image to the right by 4 pixels then
To pan by four pixels the start address needs to be advanced.
1. Calculate the amount to change start address by.
2. Increment the start address registers by the just calculated value.
To scroll by 4 lines we have to change the start address by the offset of four lines of display.
1. Calculate the amount to change start address by.
2. Increment the start address registers by the just calculated value
Set Screen1 Display Start Word Address LSB (REG[0Ch]) to 81h and Screen1 Display
Start Word Address MSB (REG[0Dh]) to 02h.
Bytes = Pixels x BitsPerPixel / 8 = 4 x 4 / 8 = 2 bytes
In this case the value writen to the start address register will be 81h (7Fh + 2 = 81h)
BytesPerLine = LineByteCount = 128
Bytes = Lines x BytesPerLine = 4 x 128 = 512 = 200h
In this case 281h (81h + 200h) will be written to the Screen 1 Start Word Address reg-
ister pair.
scroll it up by 6 pixels.
X26A-G-002-03
S1D13704
Page 45