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warren.woolseyiii
Joined: 19 Jul 2013
Posts: 10
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| External Oscillator and PLL with dsPIC33FJ64GS606 |
 Posted: Fri Jul 19, 2013 4:44 pm |
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Hi there, so I am simply trying to establish the primary oscillator as an external oscillator running at 2.4575 Mhz and using a PLL of 1 for the time being. Basically, the code compiles and I can load it through the debugger, but when I run the program it never executes down to the main. I can't set a break point anywhere above the main (using the CCS IDE) so I am assuming the fuses I set up are wrong. Any help, especially with the fuses, would be greatly appreciated!
Here is my code:
| Code: |
#include <33FJ64GS606.h> //Library for the dsPIC MCU on the board
#device ICD=3 //Using the ICD U64
#fuses EC, NOWDT, PR_PLL, IESO, CKSFSM //External Oscillator, No Watchdog Timer, Primary Oscillator with PLL, Internal External Switchover enabled, Clock Switching enabled
#use delay(oscillator=2.4575Mhz, clock=2.4575Mhz)
#define TOGGLE PIN_F5
void main() {
while (1) {
output_high(TOGGLE);
delay_ms(1000);
output_low(TOGGLE);
}
} |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19538
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| Posted: Sat Jul 20, 2013 4:54 am |
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It's not possible....
Look at the data sheet. What possible frequency output range, does the PLL support?. Look at figure 9-2 in the data sheet. Can the PLL generate 2.4575Mhz?....
From your clock, with /2 as a prescaler (minimum), the PLL will be fed with 1.22875Mhz. Then to meet the allowable output range, *82, to *162 would have to be used, giving output clock rates down to 12.5946MHz, up to 99.52Mhz.
Best Wishes |
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