SL_EX_ADDR=7_bits_address, SCL_SPEED_UP=en
Master Control Register.
| START | Setting this bit to 1 will start a master transfer. |
| RESTART | Setting this bit to 1 will generate a repeated START. |
| STOP | Setting this bit to 1 will generate a STOP condition. |
| SL_EX_ADDR | Slave Extend Address Select. 0 (7_bits_address): 7-bit address. 1 (10_bits_address): 10-bit address. |
| MCODE | Master Code. These bits set the Master Code used in Hs-mode operation. |
| SCL_SPEED_UP | Serial Clock speed Up. Setting this bit disables the master’s monitoring of SCL state for other external masters or slaves. 0 (en): Master monitors SCL state. 1 (dis): SCL state monitoring disabled. |