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TMS320F280039-Q1: Do we have any demo or recommend operation order to change the SYSCLK

Part Number: TMS320F280039-Q1
Other Parts Discussed in Thread: C2000WARE

Tool/software:

Hi experts,

I ask this for my customer.

My customer want to lower the power consumption in some situation, they don't use Low power mode,but lower the frequency of SYSCLK from 120MHz to 20MHz when code is running and they need to keep CAN, timer to work normally. They use the XTAL_OSC(20MHz) and change the PLL configuration to change the SYSCLK.

Do we have any demo or recommend operation order to change the SYSCLK in this situation?  Do I just need to follow below order or are there any other points to note??

BRs

Shuqing