S1D13700F02 Epson Electronics America, Inc., S1D13700F02 Datasheet - Page 92

• Manufacturer Part Number: S1D13700F02
• Description: Embedded Memory Graphics Lcd Controller
• Manufacturer: Epson Electronics America, Inc.

Page 92
12.5.4 Bi-directional Scrolling
S1D13700F02
X42D-A-001-01
Before scrolling
After scrolling
Where:
AP = horizontal address range (REG[06h] bits 7-0, REG[07h] bits 7-0)
C/R = character bytes per row (REG[03h] bits 7-0)
BC
FG
TUV
EFG
Note
Bi-directional scrolling can be performed only if the display memory is larger than the
physical screen in both the horizontal (REG[06h], REG[07h] > REG[03h]) and vertical
directions. Scrolling is normally done in single-character units, however the HDOT SCR
command (see REG[1Bh] bits 2-0) allows horizontal scrolling in pixel units (for text blocks
only). Single pixel horizontal scrolling can be performed using both the SCROLL and
HDOT SCR commands. For more information, see Section 15.3, “Smooth Horizontal
Scrolling” on page 115.
In 2 bpp and 4 bpp grayscale mode REG[1Bh] bits 2-0 (HDOT SCR) must be set to 0, so
horizontal scrolling can only be done in single character units (not pixel units).
TUV
Figure 12-17 Bi-Directional Scrolling
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Revision 1.01
A
ABC
BC
E FG
EFG
TUV
TUV
Display memory
C/R
Epson Research and Development
AP
Hardware Functional Specification
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Vancouver Design Center
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Issue Date: 2005/11/29
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