SPRUIZ1B July 2023 – August 2024 TMS320F28P650DH , TMS320F28P650DK , TMS320F28P650SH , TMS320F28P650SK , TMS320F28P659DH-Q1 , TMS320F28P659DK-Q1 , TMS320F28P659SH-Q1
CPU timers 0 and 1 are connected to PERx.SYSCLK. Timer 2 is connected to PERx.SYSCLK by default, but can also be connected to INTOSC1, INTOSC2, XTAL, or AUXPLLCLK using the TMR2CLKCTL register. This register also provides a separate prescale divider for timer 2. If a source other than SYSCLK is used, the SYSCLK frequency must be at least twice the source frequency to make sure of correct sampling. Each CPU has independent CPU timers and TMR2CLKCTL register.
The main reason to use a non-SYSCLK source is for internal frequency measurement. In most applications, timer 2 runs off of the SYSCLK.