SH7203 Datasheet, PDF (1270/1686 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7200 Series

Section 24 LCD Controller (LCDC)
24.3.7 LCDC Line Address Offset Register for Display Data Fetch (LDLAOR)
LDLAOR sets the address width of the Y-coordinates increment used for LCDC to read the image
recognized by the graphics driver. This register specifies how many bytes the address from which
data is to be read should be moved when the Y coordinates have been incremented by 1. This
register does not have to be equal to the horizontal width of the LCD panel. When the memory
address of a point (X, Y) in the two-dimensional image is calculated by Ax + By+ C, this register
becomes equal to B in this equation.
Bit: 15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
LAO15 LAO14 LAO13 LAO12 LAO11 LAO10 LAO9 LAO8 LAO7 LAO6 LAO5 LAO4 LAO3 LAO2 LAO1 LAO0
Initial value: 0
0
0
0
0
0
1
0
1
0
0
0
0
0
0
0
R/W: R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
Bit
Bit Name
15 to 10 LAO15 to
LAO10
9
LAO9
8
LAO8
7
LAO7
6 to 0
LAO6 to
LAO0
Initial
Value R/W
All 0 R/W
1
R/W
0
R/W
1
R/W
All 0 R/W
Description
Line Address Offset
The minimum alignment unit of LDLAOR is 16 bytes.
Because the LCDC handles these values as 16-byte
data, the values written to the lower four bits of the
register are always treated as 0. The lower four bits of
the register are always read as 0. The initial values (×
resolution = 640) will continuously and accurately place
the VGA (640 × 480 dots) display data without skipping
an address between lines. For details, see tables 24.4
and 24.5.
A binary exponential at least as large as the horizontal
width of the image is recommended for the LDLAOR
value, taking into consideration the software operation
speed. When the hardware rotation function is used,
the LDLAOR value should be a binary exponential (in
this example, 256) at least as large as the horizontal
width of the image (after rotation, it becomes 240 in a
240 × 320 panel) instead of the horizontal width of the
LCD panel (320 in a 320 × 240 panel).
Rev. 2.00 Apr. 16, 2008 Page 1240 of 1652
REJ09B0313-0200