39.4.2.1.2 8-bit Alpha Channel

Table 39-3. 8-bit Alpha Channel Memory Mapping, Little Endian Organization
Mem. addr.	0x3								0x2								0x1								0x0
Bit	31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
Pixel 8 bpp	A3								A2								A1								A0

The alpha channel is loaded from the memory and the color information is retrieved from the general-purpose register defined by the instruction’s REG field.

Table 39-4. Constant Color in the General-Purpose Register Defined by Instruction’s REG Field
Mem. addr.	0x3								0x2								0x1								0x0
Bit	31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
Pixel 8 bpp	A_c								R_c								G_c								B_c

Table 39-5. 32-bpp Final Color Used at the Input of the Alpha Blending Stage
Mem. addr.	0x3								0x2								0x1								0x0
Bit	31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
1st pixel	A0								R_c								G_c								B_c
2nd pixel	A1								R_c								G_c								B_c
3rd pixel	A2								R_c								G_c								B_c
4th pixel	A3								R_c								G_c								B_c