I2C Slave Interrupt Mask
| I2C_SIMR_DATAIM | Data Interrupt Mask |
| I2C_SIMR_STARTIM | Start Condition Interrupt Mask |
| I2C_SIMR_STOPIM | Stop Condition Interrupt Mask |
| I2C_SIMR_DMARXIM | Receive DMA Interrupt Mask |
| I2C_SIMR_DMATXIM | Transmit DMA Interrupt Mask |
| I2C_SIMR_TXIM | Transmit FIFO Request Interrupt Mask |
| I2C_SIMR_RXIM | Receive FIFO Request Interrupt Mask |
| I2C_SIMR_TXFEIM | Transmit FIFO Empty Interrupt Mask |
| I2C_SIMR_RXFFIM | Receive FIFO Full Interrupt Mask |