Gamma Correction Register
| CLUT_ADDR | Addressed color. Address of CLUT entry to be written. |
| RGB_VALUE | Mapped color (RGB). Color value to be written to the selected CLUTs. |
| B_CLUT | Select blue CLUT to be written. |
| G_CLUT | Select green CLUT to be written. |
| R_CLUT | Select red CLUT to be written. |