Renesas SH7781 User Manual
Page 931
19. Display Unit (DU)
Rev.1.00 Jan. 10, 2008 Page 901 of 1658
REJ09B0261-0100
Bit Bit
Name
Initial
Value R/W
Internal
Update Description
7 to 0
PnALPHA
Undefined R/W
Yes
Plane n Blending Ratio
The alpha value (
α) which is the blend ratio for
plane n should be set.
Blending result = (
α × plane n + (H'100 − α) ×
lower plane)/ H'100
Note: Blending result,
α, plane n, and lower
plane in the above formula are all 8-bit
data.
19.3.34
Plane n Display Size X Register (PnDSXR) (n
= 1 to 6)
The plane n display size X registers (PnDSXR, n = 1 to 6) set the display size in the horizontal
direction of plane n. The value is retained during power-on reset and manual reset.
R/W:
Internal update:
R/W:
Internal update:
16
17
18
19
20
21
22
23
24
25
26
27
28
29
31
30
Bit:
Initial value:
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
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
R
R
R
R
O
O
O
O
O
O
O
O
O
O
O
—
—
—
—
—
—
—
—
—
—
—
0
0
0
0
0
PnDSX
—
—
—
—
—
0
1
2
3
4
5
6
7
8
9
10
11
12
13
15
14
Bit:
Initial value:
Bit Bit
Name
Initial
Value R/W
Internal
Update Description
31 to 11
⎯ All
0
R
⎯ Reserved
These bits are always read as 0. The write value
should always be 0.
10 to 0
PnDSX
Undefined R/W
Yes
Plane n Display Size X
The horizontal-direction display size of plane n
should be set in dot clock units.
Note: When YC is set by the PnDDF bit in
PnMR, this value should be set to an even
number.