How to initialize the clock about the SPC560P50L5/MPC5604P?

[ananan]

The microcontroller what I used is the SPC560P50L5,but the referance datasheet is base on the MPC5604P.

this is how I initialize it .when I use these codes  in MPC5604P which the  external oscillator is 40MHZ,It operation well .but when I use these codes  in SPC560P50L5which the  external oscillator is 12MHZ,it does not work ,the program is stoped at the code "while (ME.GS.B.S_MTRANS){};"when I debug it.  

Please help me , thank you very much!

[PetrS]

Hi,

This can be due to CMU unit which checks the crystal frequency as soon as the crystal is enabled in the Mode Entry.

The CMU_0 must be initialized differently from the default value in case of 12 MHz crystal. By defaut it is checked against IRC/1. Try to set CMU_0.CSR[RCDIV] = 3 before you enable XOSC in Mode Entry.

BR, Petr

[ananan]

I try these codes,but the result is also does not work!The program stop at the while (CGM.FMLL[0].CR.B.LOCK==0){};  I have set the  CMU_0.CSR[RCDIV] = 3

[PetrS]

Hi,

try to use below code

/* Enter RUN0 with PLL as sys clk (64 MHz) with 12 MHz crystal reference. */
void InitModesAndClks(void) {
    ME.MER.R = 0x0000001D;        /* Enable DRUN, RUN0, SAFE, RESET modes */

    CGM.CMU_0_CSR.R = 0x000000004;  /* Monitor FXOSC > FIRC/4 (4MHz); no PLL monitor */
    CGM.FMPLL_CR.R = 0x09400100;    /* 12MHz xtal: Set PLL0 to 64 MHz */
    ME.RUNPC[0].R = 0x000000FE;        /* enable peripherals run in all modes */
    ME.RUN[0].R = 0x001F0074;        /* RUN0 cfg: IRCON,OSC0ON,PLL0ON,syclk=PLL */
    /* Mode Transition to enter RUN0 mode: */
    ME.MCTL.R = 0x40005AF0;        /* Enter RUN0 Mode & Key */
    ME.MCTL.R = 0x4000A50F;        /* Enter RUN0 Mode & Inverted Key */
    while (ME.GS.B.S_MTRANS) {};        /* Wait for mode transition to complete */
    while(ME.GS.B.S_CURRENTMODE != 4) {};    /* Verify RUN0 is the current mode */
}

BR, Petr