### SysTick_CALIB

Bit Field | Read/Write | Field Name | Description
--- | --- | --- | ---
31 | R | NOREF | Indicates if a reference clock is available
30 | R | SKEW | Indicates if calibration value is exactly 10 ms or not
23:0 | R | TENMS | SYSTICK counter calibration value for 10 ms. A value of 0 means the calibration value is not available

Bit Field | Field Name | Value Symbol | Value Description | Hex Value
--- | --- | --- | --- | ---
31 | NOREF | SYSTICK_NOREF | No external reference clock available | 0x1
|  | SYSTICK_REF | External reference clock available | 0x0*
30 | SKEW | SYSTICK_SKEW | Calibration value is not exactly 10 ms | 0x1*
|  | SYSTICK_NOSKEW | Calibration value is exactly 10 ms | 0x0