SPRUIZ1B July 2023 – August 2024 TMS320F28P650DH , TMS320F28P650DK , TMS320F28P650SH , TMS320F28P650SK , TMS320F28P659DH-Q1 , TMS320F28P659DK-Q1 , TMS320F28P659SH-Q1
If the application requires the PLL clock to be bypassed from the system, then the application needs to configure SYSPLLCTL1.PLLCLKEN = 0 or AUXPLLCTL1.PLLCLKEN = 0. It takes up to 120 CPU clock cycles before the bypass is effective. In the meantime, if PLLSYSCLKDIV/AUXPLLDIV is reduced to a lower value (for example, from /2 to /1 or /4 to /2), the device can be clocked above the maximum rated frequency and can lead to unpredictable device behavior. Hence, a delay of 120 CPU clock cycles is required after bypassing the PLL from the enable state, that is, going from PLLCLKEN = 1 to PLLCLKEN = 0.