SPRUIN7C March 2020 – March 2024 TMS320F280021 , TMS320F280021-Q1 , TMS320F280023 , TMS320F280023-Q1 , TMS320F280023C , TMS320F280025 , TMS320F280025-Q1 , TMS320F280025C , TMS320F280025C-Q1
The GPIO19/18 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: