S1D13705 Epson Electronics America, Inc., S1D13705 Datasheet - Page 138

• Manufacturer Part Number: S1D13705
• Description: S1d13705 Embedded Memory Lcd Controller
• Manufacturer: Epson Electronics America, Inc.

Page 46
S1D13705
X27A-G-002-02
Example 8: Pan the above portrait mode image to the right by 4 pixels then scroll it
To pan by four pixels the start address needs to be advanced.
1. Calculate the number of bytes 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 number of bytes to change start address by.
2. Increment the start address registers by the just calculated value
Bytes = Pixels x BitsPerPixel / 8 = 4 x 4 / 8 = 2 bytes
In this case the value write 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 Address register
set.
Set Screen1 Display Start Word Address LSB (REG[0Ch]) to 81h and Screen1 Dis-
play Start Word Address MSB (REG[0Dh]) to 02h.
up by 6 pixels.
Epson Research and Development
Programming Notes and Examples
Vancouver Design Center
Issue Date: 01/02/13