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raman00084@gmail.com
Joined: 28 Jul 2014
Posts: 38
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| How to enable 16X PLL in DSPIC30F6010A |
 Posted: Sat Jan 17, 2015 2:48 pm |
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Please tell me the setting for enabling 16x pll. I am using 4 mhz crystal and i use the following:
| Code: |
#FUSES NOWDT //No Watch Dog Timer
#FUSES XT_PLL16
#FUSES CKSFSM //Clock Switching is enabled, fail Safe clock monitor is enabled
#FUSES NOBROWNOUT //No brownout reset
#device ICSP=1
#use delay(clock=64MHz,crystal=4MHz)
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Not working. Please guide where i am wrong.
If i use only
| Code: | | #use delay(crystal=4mhz) |
it works.
Regards |
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cbarberis
Joined: 01 Oct 2003
Posts: 172
Location: Punta Gorda, Florida USA
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| Posted: Sun Jan 18, 2015 11:11 am |
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This can be answered in various ways depending on the version of your compiler. For what I understand on the latest version 5.xx the compiler sets up the correct fuses for you when you use the #use delay(crystal=xxMHz) statement. So if your crystal= 4MHz and you want to use 16X PLL (providing this feature is applicable in the PIC hardware) you would only need to use the following statement: #use delay(crystal=64MHz)
You do not need to use the: #FUSES XT_PLL16 or #FUSES HS, however I do believe that you can still declare other oscillator setup like: #FUSES CKSFSM |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19510
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| Posted: Sun Jan 18, 2015 12:24 pm |
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Agreed.
However the other possible problem, is that he may need to actually enable the primary oscillator.
On quite a few chips like this, you must both setup the oscillator, and separately enable it.
Big question is 'what compiler version'?.
Vital for a question like this, since as Cbarberis says, the default behaviour for several of the settings, changes with compiler version.
Have just checked, and this chip isn't one that requires a separate oscillator enable.
You wouldn't use 'crystal=64M', since this is illegal...
Have just tested with:
| Code: |
#include <30F6010A.h>
#FUSES NOWDT
#FUSES NOMCLR
#FUSES XT_PLL16
#FUSES CKSFSM
#FUSES BORV27
#FUSES NOBROWNOUT //No brownout reset
#device ICSP=1
#use delay(clock=64MHz) //Since the oscillator is setup above, just
//tell the compiler what frequency the chip is running.
void main(void)
{
while(TRUE)
{
output_toggle(PIN_G2);
delay_ms(100);
}
}
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And 5.028, and it merrily runs OK, and at the right frequency with a 4Mhz crystal.
The only things I changed, were MCLR (the board I have this chip on doesn't have a pull up on this signal), and setting the brownout voltage (though it is disabled). I've had some oddities with a couple of chips in this family, if the brownout voltage is set to the 'reserved' setting (the default), not working properly even if the brownout is disabled.... |
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