S1D13700F01 Epson Electronics America, Inc., S1D13700F01 Datasheet - Page 46
S1D13700F01
Manufacturer Part Number
S1D13700F01
Description
Embedded Memory Graphics Lcd Controller
Manufacturer
Epson Electronics America, Inc.
Datasheet
1.S1D13700F01.pdf
(133 pages)
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bit 5
bit 4
S1D13700F01
X42A-A-002-04
Figure 10-1 Screen Origin Compensation and HDOT SCR Adjustment
This bit causes the S1D13700F01 to offset the text screen against the graphics back layer
by one vertical pixel. To shift the text screen horizontally, the horizontal pixel scroll
function (REG[1Bh] or the HDOT SCR command for indirect addressing) can be used to
shift the text screen 1 to 7 pixels to the right. If both of these functions are enabled, all
characters have the appropriate surrounding back-ground pixels to ensure easy reading of
the inverted characters.
When this bit = 0, screen origin compensation is done.
When this bit = 1, screen origin compensation is not done.
The following figure shows an example of screen origin compensation and the HDOT SCR
command in use.
Screen Origin Compensation (IV)
This bit controls Screen Origin Compensation which is used for inverse display and is
usually set to 1. A common method of displaying inverted characters is to Exclusive-OR
the text layer with the graphics back-ground layer. However when this is done, the
inverted characters at the top or left of the screen become difficult to read. This is because
the character origin is at the top-left of its bitmap and there are no background pixels
either above or to the left of these characters.
Reserved
The default value for this bit is 1.
HDOT SCR
(REG[1Bh])
Back layer
Character
Display start point
Dots 1 to 7
REG[00h] bit 5 = 0
Revision 4.05
1 dot
Epson Research and Development
Hardware Functional Specification
Vancouver Design Center
Issue Date: 2005/12/13
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