SED1374 Datasheet, PDF (90/420 Pages) Epson Company – SED1374 Embedded Memory Color LCD Controller

Page 82
Epson Research and Development
Vancouver Design Center
12.2.1 How to Set Up Alternate SwivelView Mode
The following describes the register settings needed to set up Alternate SwivelView Mode
for a 160x240x8 bpp image.
• Select Alternate SwivelView Mode:
REG[1Bh] bit 7 = 1 and bit 6 = 1
• The display refresh circuitry starts at pixel “B”, therefore the Screen 1 Start Address
register must be programmed with the address of pixel “B”, or
REG[0Dh], REG[0Ch]= AddressOfPixelB
= (AddressOfPixelA + ByteOffset)
= AddressOfPixelA + _^{1----6---0---p---i--x-8---e-b--l-p-s---b-×}----8----b---p---p--_ – 1
= AddressOfPixelA + 9Fh
Where bpp is bits-per-pixel and bpb is bits-per-byte.
• The Line Byte Count Register for SwivelView Mode must be set to the image width in
bytes, i.e.
REG[1Ch]
=
160
-₍--8---b----p---b---₎----_÷-----₍--8----b---p---p----₎
=
160
----1----
=
160
=
A0h
Where bpb is bits-per-byte and bpp is bits-per-pixel.
• Panning is achieved by changing the Screen 1 Start Address register:
• Increment the register by 1 to pan horizontally by one byte, e.g. one pixel in 8 bpp
mode
• Increment the register by the value in the Line Byte Count register to pan vertically by
one line, e.g. add A0h to pan by one line in the example above
SED1374
X26A-A-001-02
Hardware Functional Specification
Issue Date: 99/04/29