SED1374 Datasheet, PDF (88/420 Pages) Epson Company – SED1374 Embedded Memory Color LCD Controller

Page 80
Epson Research and Development
Vancouver Design Center
12.1.1 How to Set Up Default SwivelView Mode
The following describes the register settings needed to set up Default SwivelView Mode
for a 240x320x4 bpp image:
• Select Default SwivelView Mode: REG[1Bh] bit 7 = 1 and bit 6 = 0
• The display refresh circuitry starts at pixel “B”, therefore the Screen 1 Start Address
register must be programmed with the address of pixel “B”, i.e.
REG[0Dh], REG[0Ch]= AddressOfPixelB
= (AddressOfPixelA + ByteOffset)
= AddressOfPixelA + _^{2----4---0---p---i--x-8---e-b--l-p-s---b-×}----4----b---p---p--_ – 1
= AddressOfPixelA + 77h
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 virtual-image
width in bytes, i.e.
REG[1Ch] = ₍---8---b----p---b---₎-2---_÷^5---6--₍--4----b---p---p----₎ = ^2---52----6- = 128 = 80h
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. two pixels in 4 bpp
mode
• Increment the register by twice the value in the Line Byte Count register to pan verti-
cally by two lines, e.g. add 100h to pan by two lines in the example above.
Note
Vertical panning by a single line is not supported in Default SwivelView Mode.
SED1374
X26A-A-001-02
Hardware Functional Specification
Issue Date: 99/04/29