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FreeRTOS with PIC18 and ECPLL

Posted by Bob Cobb on August 7, 2008
I am using FreeRTOS with a PIC18F87J11. I have a 10 MHz clock input and plan to use the PLL to run it at 40 MHz. I set the configuration bits to use ECPLL, and set the OSCTUNEbits.PLLEN to 1. If I run the code using a Real ICE emulator, the PIC will continuously reset. If I set the OSCTUNEbits.PLLEN to 0, the code runs fine at the lower speed. If I program the part and let it run stand-alone, it doesn’t run at all. I have not had this problem with other RTOS’s on the same part (and board), but I’m not sure if it is the RTOS. I’m open to any suggestions and questions!

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