Display Control Unit (DCU)
MPC5606S Microcontroller Reference Manual, Rev. 7
Freescale Semiconductor 415
Table 12-61 defines how the settings of the BB and AB bit fields affect the pixels in the layer; RGB modes
are 1 bpp, 2 bpp, 4 bpp, 8 bpp, RGB565, and RGB888; ARGB modes are ARGB1555, ARGB4444, and
ARGB8888.
Figure 12-60 to Figure 12-68 illustrate the effect of the cases identified in Table 12-61. In all cases there
is a single active layer and a white background color.
Table 12-61. Blend options for BB and AB configurations
Case BB AB[1:0] Format Function
1 0 00 RGB No blending, underlying pixels are obscured
2 1 00 RGB Selected pixels are completely removed
3 0 01 RGB The value in TRANS becomes the alpha channel of all pixels
on the layer
4 1 01 RGB The value in TRANS becomes the alpha channel of the
selected pixels on the layer
5 0 10 RGB Same as case 3
6 1 10 RGB Selected pixels are completely removed and the value in
TRANS becomes the alpha channel of the non-selected pixels
on the layer
7 0 11 RGB Reserved
8 1 11 RGB Reserved
9 0 00 ARGB No blending, pixel alpha is ignored and underlying pixels are
obscured
10 1 00 ARGB Selected pixels are completely removed, pixel alpha is ignored
11 0 01 ARGB Pixel alpha is used to blend layer with underlying pixels. Value
in TRANS is ignored.
12 1 01 ARGB Uses the pixel alpha of the selected pixels only to blend layer
with underlying pixels. Value in TRANS is ignored.
13 0 10 ARGB The value in TRANS is multiplied with the pixel alpha value and
the resultant alpha is used to blend all the pixels
14 1 10 ARGB Selected pixels are completely removed, the value in TRANS
is multiplied with the pixel alpha value and the resultant alpha
is used to blend the non-selected pixels on the layer
15 0 11 ARGB Reserved
16 1 11 ARGB Reserved
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