HD6417727BP160CV Datasheet, PDF (832/1098 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH™ RISC engine Family/ SH7700 Series

Section 25 LCD Controller
25.2.5 LCDC Start Address Register for Upper Display Data Fetch (LDSARU)
LDSARU sets the start address from which data is fetched by the LCDC for upper display of the
LCDC panel. When a DSTN panel is used, this register specifies the fetch start address for the
upper side of the panel.
Bit: 31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
—
—
—
—
—
— SAU25 SAU24 SAU23 SAU22 SAU21 SAU20 SAU19 SAU18 SAU17 SAU16
Initial value: 0
0
0
0
1
1
0
0
0
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: 15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
SAU15 SAU14 SAU13 SAU12 SAU11 SAU10 SAU9 SAU8 SAU7 SAU6 SAU5 SAU4 SAU3 SAU2 SAU1 SAU0
Initial value: 0
0
0
0
0
0
0
0
0
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
Bits 31 to 26—Reserved
Bits 25 to 0—Start Address for Upper Display Data Fetch (SAU31 to SAU0): The start
address for data fetch of the display data must be set within the synchronous DRAM area of area
3.
Notes: 1. When using the hardware rotation function (ROT = 1), set the LDSARU value so that
the upper-left address of the image is aligned with the 512-byte boundary.
2. When the hardware rotation function is used (ROT = 1), set the upper-left address of
the image which can be calculated from the display image size in this register. The
equation below shows how to calculate the LDSARU value when the image size is 240
× 340 and LDLAOR = 256. The LDSARU value is obtained not from the panel size but
from the memory size of the image to be displayed. Note that LDLAOR must be a
binary exponential at least as large as the horizontal width of the image. Calculate
backwards using the LDSARU value (LDSARU − 256 (LDLAOR value) × (320 − 1))
to ensure that the upper-left address of the image is aligned with the 512-byte
boundary.
LDSARU = (upper-left address of image) + 256 (LDLAOR value) × 319 (line)
Rev.6.00 Mar. 27, 2009 Page 774 of 1036
REJ09B0254-0600