SPRUIZ1B July 2023 – August 2024 TMS320F28P650DH , TMS320F28P650DK , TMS320F28P650SH , TMS320F28P650SK , TMS320F28P659DH-Q1 , TMS320F28P659DK-Q1 , TMS320F28P659SH-Q1
The GPIO220/221 alternate functionality on X1/X2 can be used to speed up the start-up time of the crystal by as much as 30% if needed. This functionality is achieved by preconditioning the load capacitors CL1 and CL2 to a known state before the XTAL is turned on.
The steps below outline the procedure to precondition X1/X2 before turning on the XTAL: