CRS control register
| SYNCOKIE | SYNC event OK interrupt enable |
| SYNCWARNIE | SYNC warning interrupt enable |
| ERRIE | Synchronization or trimming error interrupt enable |
| ESYNCIE | Expected SYNC interrupt enable |
| CEN | Frequency error counter enable This bit enables the oscillator clock for the frequency error counter. When this bit is set, the CRS_CFGR register is write-protected and cannot be modified. |
| AUTOTRIMEN | Automatic trimming enable This bit enables the automatic hardware adjustment of TRIM bits according to the measured frequency error between two SYNC events. If this bit is set, the TRIM bits are read-only. The TRIM value can be adjusted by hardware by one or two steps at a time, depending on the measured frequency error value. Refer to Section7.3.4: Frequency error evaluation and automatic trimming for more details. |
| SWSYNC | Generate software SYNC event This bit is set by software in order to generate a software SYNC event. It is automatically cleared by hardware. |
| TRIM | HSI48 oscillator smooth trimming These bits provide a user-programmable trimming value to the HSI48 oscillator. They can be programmed to adjust to variations in voltage and temperature that influence the frequency of the HSI48. The default value is 32, which corresponds to the middle of the trimming interval. The trimming step is around 67 kHz between two consecutive TRIM steps. A higher TRIM value corresponds to a higher output frequency. When the AUTOTRIMEN bit is set, this field is controlled by hardware and is read-only. |