Internal clock sources calibration register
| HSICAL | HSI16 clock calibration These bits are initialized at startup with the factory-programmed HSI16 calibration trim value. When HSITRIM is written, HSICAL is updated with the sum of HSITRIM and the factory trim value. |
| HSITRIM | HSI16 clock trimming These bits provide an additional user-programmable trimming value that is added to the HSICAL[7:0] bits. It can be programmed to adjust to variations in voltage and temperature that influence the frequency of the HSI16. The default value is 16, which, when added to the HSICAL value, should trim the HSI16 to 16 MHz � 1 %. |