Display Control Unit (DCU)MPC5606S Microcontroller Reference Manual, Rev. 7Freescale Semiconductor 415Table 12-61 defines how the settings of the BB and AB bit fields affect the pixels in the layer; RGB modesare 1 bpp, 2 bpp, 4 bpp, 8 bpp, RGB565, and RGB888; ARGB modes are ARGB1555, ARGB4444, andARGB8888.Figure 12-60 to Figure 12-68 illustrate the effect of the cases identified in Table 12-61. In all cases thereis a single active layer and a white background color.Table 12-61. Blend options for BB and AB configurationsCase BB AB[1:0] Format Function1 0 00 RGB No blending, underlying pixels are obscured2 1 00 RGB Selected pixels are completely removed3 0 01 RGB The value in TRANS becomes the alpha channel of all pixelson the layer4 1 01 RGB The value in TRANS becomes the alpha channel of theselected pixels on the layer5 0 10 RGB Same as case 36 1 10 RGB Selected pixels are completely removed and the value inTRANS becomes the alpha channel of the non-selected pixelson the layer7 0 11 RGB Reserved8 1 11 RGB Reserved9 0 00 ARGB No blending, pixel alpha is ignored and underlying pixels areobscured10 1 00 ARGB Selected pixels are completely removed, pixel alpha is ignored11 0 01 ARGB Pixel alpha is used to blend layer with underlying pixels. Valuein TRANS is ignored.12 1 01 ARGB Uses the pixel alpha of the selected pixels only to blend layerwith underlying pixels. Value in TRANS is ignored.13 0 10 ARGB The value in TRANS is multiplied with the pixel alpha value andthe resultant alpha is used to blend all the pixels14 1 10 ARGB Selected pixels are completely removed, the value in TRANSis multiplied with the pixel alpha value and the resultant alphais used to blend the non-selected pixels on the layer15 0 11 ARGB Reserved16 1 11 ARGB Reserved
