S1D13700F02 Epson Electronics America, Inc., S1D13700F02 Datasheet - Page 65

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

Epson Research and Development
Vancouver Design Center
HDOT SCR
bits 2-0
Hardware Functional Specification
Issue Date: 2005/11/29
REG[1Bh] Horizontal Pixel Scroll Register
Address = 801Bh
7
6
Default = 00h
Note
The HDOT SCR command sets the horizontal scroll position when indirect addressing is
used. The values from REG[1Bh] are passed as parameters when the HDOT SCR command
is issued. For further information on the HDOT SCR command, see Section 11.1.9, “HDOT
SCR” on page 74.
Normal scrolling on text screens allows scrolling of entire characters only. The HDOT SCR
command provides horizontal pixel scrolling for text screens. HDOT SCR cannot be used
on individual layers.
Horizontal Pixel Scroll bits [2:0]
These bits specify the number of horizontal pixels to scroll the display. The character
bytes per row (C/R), REG[03h] bits 7-0, must be set to one more than the actual number of
horizontal characters before using horizontal pixel scroll. Smooth scrolling can be simu-
lated by repeatedly changing the value of REG[1Bh] bits 2-0. See Section 12.5.6, “Hori-
zontal Pixel Scrolling (HDOTSCR)” on page 94 for more information on scrolling the
display.
HDOT SCR must be set to zero for all display modes except 1 bpp (REG[20h] Bit-Per-
Pixel Select Register bits 1-0 = 0).
n/a
5
Z
M/N is the number of bits (dots) that parameter 1 (P1)
is incremented/decremented by.
M
Z
A
Figure 10-10 Horizontal Scrolling
A
B
A
B
4
B
Display width
Revision 1.01
3
X
X
X
Y
N
Y
Y
2
Horizontal Pixel Scroll bits 2-0
M = 0
N = 0
1
Read/Write
X42D-A-001-01
S1D13700F02
0
Page 65