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TMS320F2800156-Q1: Configuration of clock (SYSCLKDIVSEL)

Part Number: TMS320F2800156-Q1
Other Parts Discussed in Thread: C2000WARE

Tool/software:

Development envirement:

MCU: TMS320F2800156-Q1

TRM: TMS320F280015x Real-Time Microcontrollers Technical Reference Manual_RevB_.pdf

CCS: 12.7

SDK: C2000Ware_5_02_00_00

I have a question about the configuration of clock (SYSCLKDIVSEL). When I configure SYSCLKDIVSEL with driverlib function SysCtl_setClock(), step 3 is my expected result, why do I have to execute Step 1?

Can you tell me some details?

/BR

Samuel