MPC5644A @ 120MHz Flash

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MPC5644A @ 120MHz Flash

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ivanzoli
Contributor I

Hi,

I am trying to run an MPC5644A @ 120MHz from a 8MHz xtal (the one on the demoboard.

I am using this code:

void ClockSetSysClk_120MHz(void)
{
   ECSM.MUDCR.R = 0x40000000; // 1 SRAM waitstate for fsys above 98MHz

   FMPLL.ESYNCR2.R = 0x00000001; // Clock / 4
   FMPLL.ESYNCR1.R = 0xF000003C; // Pll X 60
   while (FMPLL.SYNSR.B.LOCK != 1) {}; // Wait for FMPLL to LOCK

}

This is working great running from RAM but not from FLASH. The system goes in exception (I think I lose the FLASH controller somehow...) Someone can please help me to understand what I miss?

Thank you

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davidtosenovjan
NXP TechSupport
NXP TechSupport

Pay attention to following example code, function FMPLL_init:

https://community.nxp.com/docs/DOC-101455 

 

Code selects used board at the beginning of main function by following macros:

#define XPC564AKIT176S 0

#define XPC564AKIT208S 1

#define XPC564AKIT324S 2

/* Choose one of 3 options above according to your configuration */

#define USED_BOARD XPC564AKIT324S

 

Possible issues are:

- XPC564AKIT176S and XPC564AKIT208S use 8MHz crystal

- XPC564AKIT324S uses 40MHz crystal

- 1 SRAM waitstate for fsys above 98MHz

- CLKOUT frequency must be 66MHz at most

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