For normal mode operation the accuracy of signals generated by EPWM controller is 1 peripheral clock period i.e. TSCLK = 1/Fsclk.
However while operating in High precision mode the effective EPWM accuracy is increased by a factor of M where M is number of bits in PWM_HPxHy register used for edge placement and is dependent on the frequency of operation . The High Precision PWM (HPPWM) module thus provides increased performance to the PWM unit by increasing its resolution by M bits (M < 6). The enhanced effective resolution is therefore TSCLK / 2^M.
M is 6 when Fsclk = 125 MHz and is less than six for lower frequencies.