Epson S1D13705 technical manual Vancouver Design Center

Page 46	Epson Research and Development
	Vancouver Design Center

Example 8: Pan the above portrait mode image to the right by 4 pixels then scroll it up by 6 pixels.

To pan by four pixels the start address needs to be advanced.

1.Calculate the number of bytes to change start address by. Bytes = Pixels x BitsPerPixel / 8 = 4 x 4 / 8 = 2 bytes

2.Increment the start address registers by the just calculated value.

In this case the value write to the start address register will be 81h (7Fh + 2 = 81h)

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. BytesPerLine = LineByteCount = 128

Bytes = Lines x BytesPerLine = 4 x 128 = 512 = 200h

2.Increment the start address registers by the just calculated value

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.

S1D13705	Programming Notes and Examples
X27A-G-002-03	Issue Date: 02/01/22