Programming Model
MOTOROLA
LCD Controller
19-21
19.4.3 Virtual Page Width Register
The Virtual Page Width Register defines the width of the virtual page for the LCD panel. See Figure 19-2.
Table 19-10. Size Register Description
Name
Description
Reserved
Bits 31–26
Reserved—These bits are reserved and should read 0.
XMAX
Bits 25–20
Screen Width Divided by 16
—Holds screen x-axis size, divided by 16. For black-and-white panels
(1 bpp), XMAX [20] is ignored, forcing the x-axis of the screen size to be a multiple of 32 pixels/line.
Reserved
Bits 19–9
Reserved—These bits are reserved and should read 0.
YMAX
Bits 8–0
Screen Height
—Specifies the height of the LCD panel in terms of pixels or lines. The lines are
numbered from 1 to YMAX for a total of YMAX lines.
VPW
Virtual Page Width Register
Addr
0x00205008
BIT
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
TYPE
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
RESET
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0x0000
BIT
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
VPW
TYPE
r
r
r
r
r
r
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
RESET
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0x0000
Table 19-11. Virtual Page Width Register Description
Name
Description
Reserved
Bits 31–10
Reserved—These bits are reserved and should read 0.
VPW
Bits 9–0
Virtual Page Width
—Defines the virtual page width of the LCD panel. The VPW bits represent the
number of 32-bit words required to hold the data for one virtual line. VPW is used in calculating the
starting address representing the beginning of each displayed line.
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