SPRUIN7C March 2020 – March 2024 TMS320F280021 , TMS320F280021-Q1 , TMS320F280023 , TMS320F280023-Q1 , TMS320F280023C , TMS320F280025 , TMS320F280025-Q1 , TMS320F280025C , TMS320F280025C-Q1
One of INTOSC2, XTAL, or INTOSC1 must be chosen to be the controlling reference clock (OSCCLK) for the CPU and most of the peripherals. OSCCLK can be used directly or applied through the system PLL to reach a higher frequency. At reset, OSCCLK is the default system clock and is connected to INTOSC2.