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MB86R02 'Jade-D' Hardware Manual V1.64
L4BLD (L4 Blend)
Register
DisplayBaseAddress + 0x194
address
Bit number
31 30 29 28 ----- 20 19 18 17 16
Bit field name
R/W
Initial value
This register specifies the blend parameters for the L4 layer.
Bit 7 to 0
L4BR (L4 layer Blend Ratio)
Sets the blend ratio. Basically, the blend ratio is setting value/256.
Bit 13
L4BP (L4 layer Blend Plane)
Specifies that the L5 layer is the blend plane.
0
Value of L4BR used as blend ratio
1
Pixel of L5 layer used as blend ratio
Bit 14
L4BI (L4 layer Blend Increment)
Selects whether or not 1/256 is added when the blend ratio is not "0".
0
Blend ratio calculated as is
1/256 added when blend ratio ≠ 0
1
Bit 15
L4BS (L4 layer Blend Select)
Selects the blend calculation expression.
Upper image × Blend ratio + Lower image × (1 – Blend ratio)
0
Upper image × (1 – Blend ratio) + Lower image × Blend ratio
1
Bit 16
L4BE (L4 layer Blend Enable)
This bit enables blending.
0
Overlay via transparent color
1
Overlay via blending
Before blending, the blend mode must be specified using L4BE and alpha must also be enabled for
L4 layer display data. For direct color, alpha is specified using the MSB of data; for indirect color,
alpha is specified using the MSB of palette data.
Reserved
L4BE L4BS L4BI L4BP
R0
RW
RW
0
0
15
14
13 12 11 10 9 8 7 6 5 4 3 2 1 0
Reserved
RW
RW
RW0
X
X
X
0
L4BR
RW
X
18-107
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