SWCU192 November 2021 CC1312R7 , CC1352P7 , CC2652P7 , CC2652R7
The samplestamp generator counts frames (WCLK periods) and 48 MHz clock cycles (crystal oscillator periods) within each frame:
Software can modify the value of I2S:STMPWCNT by writing an absolute value to I2S:STMPWSET or a relative value to I2S:STMPWADD.