Hi I am using a PIC18F452 with an external 8MHz crystal. I am trying to enable the HS+PLL Enabled mode, the device programs okay, and when read back, the configuration values are correct, however, in use, the device is still running at 8MHz. I am using MPLAB 6.62 with an ICDII. Can anyone suggest a reason why the PLL may not be working. Thanks John Lucas
PIC 18 Series - HS+PLL Enabled Clock Mode
Started by ●October 8, 2004
Reply by ●October 8, 20042004-10-08
> I am using a PIC18F452 with an external 8MHz crystal. I am trying to > enable the HS+PLL Enabled mode, the device programs okay, and when > read back, the configuration values are correct, however, in use, the > device is still running at 8MHz. I am using MPLAB 6.62 with an ICDII. > Can anyone suggest a reason why the PLL may not be working. > > Thanks > > John LucasIn the ICD2 help file under 18Fxxxx limitations look for the note on Programmer Limitations for programming the PLL. I think you have to remove power after programming PLL, then re-apply for the change to take affect. Assuming you have it set under Configure >>Configuration Bits... HS-PLL Enabled, it should work. -- -Bruce http://www.rentron.com
Reply by ●October 11, 20042004-10-11