I want to change the frequency of PLL1

[DELPHI_Eric]

I want to change the frequency of PLL1，

#ifdef XOSC40MHZ

    #ifdef PLL0_160MHZ

    /* Setup PLL0 - 160MHz @ 40MHz XOSC */

    PLLDIG.PLL0DV.R = 0x20041010UL; /* RFDPHI1 = 4, RFDPHI = 4, PREDIV = 1,

                                       MFD = 16, fVCO = 640MHz*/

    #endif

#endif

#ifdef XOSC40MHZ

    #ifdef PLL1_200MHZ

    /* Setup PLL1 - 200MHz @ 40MHz XOSC */

    PLLDIG.PLL1DV.R = 0x00020004UL; /* RFDPHI = 2 (divider=4), MFD = 20,

                                       fVCO = 800MHz 200MHZ（0x00020014UL）160MHZ（0x00020004UL）*/

when PLLDIG.PLL1DV.R = 0x00020004UL;can not debug at while(MC_ME.GS.B.S_MTRANS == 1);                     
but when PLLDIG.PLL1DV.R = 0x00020014UL;can through while(MC_ME.GS.B.S_MTRANS == 1); 

Original Attachment has been moved to: sys.c.zip

[martin_kovar]

Hi,

to set the frequency of PLL1 to 200MHz, please use this code:

// Set PLL1 to 200 MHz with 40MHz XOSC reference

      PLLDIG.PLL1DV.R = 0x00020014;      // MFD = 20, RFDPHI = 2

      // Mode Transition to enter RUN0 mode:

      MC_ME.MCTL.R = 0x40005AF0;     // Enter RUN0 Mode & Key

      MC_ME.MCTL.R = 0x4000A50F;     // Enter RUN0 Mode & Inverted Key

      while (MC_ME.GS.B.S_MTRANS) {};     // Wait for mode transition to complete

      while(MC_ME.GS.B.S_CURRENT_MODE != 4) {};     // Verify RUN0 is the current mode

Of course, you can use mode transition to another mode. It does not have to be RUN0. This is just example.

Regards,

Martin

[DELPHI_Eric]

Thank you Martin!Now,I make the following settings, the PLL1 code correctly?How can I verify the PLL1 becomes 160MHz?

#ifdef XOSC8MHZ

    #ifdef PLL0_160MHZ

    /* Setup PLL0 - 160MHz @ 8MHz XOSC */

    PLLDIG.PLL0DV.R = 0x40022050U; /* RFDPHI1 = 4, RFDPHI = 4, PREDIV = 1,

                                       MFD = 16, fVCO = 640MHz */

    #endif

#endif

#ifdef XOSC8MHZ

    #ifdef PLL1_160MHZ

    /* Setup PLL1 - 160MHz @ 8MHz XOSC */

   PLLDIG.PLL1DV.R = 0x00020004U; /* RFDPHI = 2 (divider=4), MFD = 20,

                                       fVCO = 800MHz */

    #endif

#endif

[martin_kovar]

Hi,

please use this excel calculator to check your configuration.

Excel MPC5744P Clock Configurator

Regards,

Martin

[yunangong-b1900]

Hi Martin,

The tool is very helpful. One question from my side is:

Is there any max/min VCO frequency specification of PLL0 and PLL1 on MPC5744P?

Best Regards

Yunan Gong

NXP Auto FAE

[martin_kovar]

Hi,

please look at the data sheet.

Regards,

Martin

[DELPHI_Eric]

Hi,

Is there some tool like S12 Processor Expert for the MPC57xx-56xx,thanks.

[martin_kovar · Accepted solution]

Hi,

I have already answered this question in the following thread:

https://community.nxp.com/thread/436645 

Regards,

Martin

[DELPHI_Eric]

Already according to your configuration file, now how can I do to detect PLL1 output 160MHz? Such as bus clock output pin, with an oscilloscope measurementI mean, how to measure the MCU output pin to determine whether it is configured to 160MHz？

[DELPHI_Eric]

Thanks Martin!