Help with PIC18F25K80 and ceramic resonators
Hi, I inherited a design , using PIC18F25K80 that originally used 4Mhz Murata resonators with 30pf tanks. This was then changed about a year ago to 16MHz Murata with similar tanks
What we are seeing is a small cross section of boards fail with any about Vdd of 3.2V ( these are 5V boards) , at this point the clock fails and because the BOR is below this level ( 3.0V) it never gets triggered on a power down. We have noticed therefore occasional corrupt EEPROM or FLASH.
Yet some users have boards that do operate to below the BOR point ( which is all we require )
Can the PIC 18F25K80 actually drive these resonators at 16Mhz , we find HS1 or HS2 has no real effect on the point where teh clocks fails
We are obviously thinking of changing to crystals , but we could do with finding a verifiable reason.
Any pointers ?