Post by thread:[PICLIST] OSC SPEED

Hi, I have the 16f84 4mhz micro and I goto a 16f84a 20mhz micro so I swapped out the 4mhz ceramic resonator w/caps with a 20 mhz and nothing happens, if i substitute the 4mhz back in it works fine?... does anyone know why the 20mhz doesn't work? wouldn't work? the exact numbers on the new micro are pic16f84a - 20/p 0048HEJ thanks tyson stephen spam_OUTtysonstephenTakeThisOuThome.com -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

Also could be not bad to switch from XT to HC mode as well as applying two 20pF(15..33) capacitors from osc pins to ground, just for some reason ;) Finally check if crystal itself is good (try another one) WBR Dmitry. Tyson Stephen wrote: > > Hi, I have the 16f84 4mhz micro and I goto a 16f84a 20mhz micro so I swapped out the 4mhz ceramic resonator w/caps with a 20 mhz and nothing happens, if i substitute the 4mhz back in it works fine?... does anyone know why the 20mhz doesn't work? wouldn't work? the exact numbers on the new micro are pic16f84a - 20/p 0048HEJ -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics