Internal Quartz and PLL
Posted: Thu Jun 10, 2010 7:24 pm
Hi Lubin, I already told you but i write it there to give the solution to everyone
If you want to use the internal quartz with a dspic33fj128gp802/804 (maybe you will have the same problem with others micro-controllers but i tested these two), the PLL value is not taken into account which prevents you from choosing the number of instructions you want.
The solution i found is to go into the main source file created when you compile and change _FOSCSEL( FNOSC_FRC & IESO_OFF & 0xFFFF ) by _FOSCSEL( FNOSC_FRCPLL & IESO_OFF & 0xFFFF ).
All the others registers to select the different prescalers are correct so you should have the right number of MIPS.
If you want to use the internal quartz with a dspic33fj128gp802/804 (maybe you will have the same problem with others micro-controllers but i tested these two), the PLL value is not taken into account which prevents you from choosing the number of instructions you want.
The solution i found is to go into the main source file created when you compile and change _FOSCSEL( FNOSC_FRC & IESO_OFF & 0xFFFF ) by _FOSCSEL( FNOSC_FRCPLL & IESO_OFF & 0xFFFF ).
All the others registers to select the different prescalers are correct so you should have the right number of MIPS.