FRC CLOCK PROBLEM for DSPIC33EP128MC502

[JustinS]

I have problem with setting DSPIC33EP128MC502 to work with 120MHz.

Below I've included my code and my Project Settings. I would be grateful for any help.

[Benj]

I have some known working code for this.

I'll try and remember to dig it out for you tonight.

[Benj]

This code works for me, adjust the timings as needed.

Code: Select all

//Setup configuration for 138.1875MHz or 69MIPs using 7.37MHz Internal Osc
PLLFBD = 73;// M=75
CLKDIVbits.PLLPOST = 0;// N1=2
CLKDIVbits.PLLPRE = 0;// N2=2
OSCTUN = 0;//Tune FRC oscillator, if FRC is used

//Disable Watch Dog Timer
RCONbits.SWDTEN = 0;// Clock switching to incorporate PLL

__builtin_write_OSCCONH(0x01);// Initiate Clock Switch to FRC

// Oscillator with PLL (NOSC=0b011)
__builtin_write_OSCCONL(0x01);// Start clock switching

while(OSCCONbits.COSC != 0b001);

// Wait for Clock switch to occur
while(OSCCONbits.LOCK != 1);

You also need the right config settings for it to work.

Config.jpg (185.65 KiB) Viewed 5186 times

[JustinS]

Thank you very much! You're a life saver