39.4.2.3 Color Look-Up Table (CLUT)
The GFX2D module includes two CLUTs. Each CLUT includes 256 entries containing 32 bits. Each entry contains a 32-bpp ARGB color.
| 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 |
| Color entry | A | R | G | B | ||||||||||||||||||||||||||||
The CLUT can be loaded using an LDR instruction with the LDRC bit set. The LDRCID bit indicates the targeted CLUT. The LDRCS bit provides the amount of data to be loaded. Using a reduced CLUT mapping (i.e., 16 entries) reduces the number of accessible colors but improves loading time. The data structure is loaded from a memory location defined by the address in the REG field.