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TMS320F28335: How to change the frequency of SYSCLK.

Dong Hua Jung
Prodigy 140 points
Part Number: TMS320F28335

Hello, I'm trying to find the default frequency of SYSCLK and how to change it. on F28335 I know there is a register that can change the Frequency but i cannot find it now. 

I wanna know which technical documents can i find the related information in. I've tried the one of "TMS320F2833x, TMS320F2823x Digital Signal Controllers (DSCs)",  "

TMS320x2833x, 2823x System Control and Interrupts", and "TMS320C28x CPU and Instruction Set". 

Thanks 

Sincerely

Jacky 

"

  • 0
    Guru 192875 points

    Hi,

    Dong Hua Jung said:
    'm trying to find the default frequency of SYSCLK and how to change it. on F28335

    Let me provide you the required info:

    In code you need to navigate to 'DSP2833x_SysCtrl.c' file and under InitSysCtrl(void) function you've InitPll(DSP28_PLLCR,DSP28_DIVSEL);

    The values of DSP28_PLLCR & DSP28_DIVSEL are initialized in DSP2833x_Examples.h

    Also, you need to refer 'SPRUFB0D' ie System Control and Interrupts Userguide Page no. 46, Section 5.2.5 PLL Control, Status and XCLKOUT Register Descriptions. Refer the table and understand the configuration.

    Regards,

    Gautam