PIC16F684故障安全监测和时钟频率切换

ThisapplicationnotediscussestheFail-Safe

MonitoringandClockSwitchingfeaturesonthenew

8/14/20-pinFlashmicrocontrollerfamily.Thisnew

familyofmicrocontrollerstakesMicrochip'sMid-Range

Familyofproductstothenextlevelwithitsnew8MHz

internaloscillatorthatcanbeswitchedinrealtimefrom

8MHzdownto31kHz(8steps).Inaddition,thedevice

containsafail-safefeaturethatmonitorstheexternal

(primary)oscillatorandwillautomaticallyswitchoverto

theinternal(secondary)oscillatoriftheprimary

oscillatorfails.Thesenewfeaturesmakeapplications

morerobustintheeventofaprimaryoscillatorfailure

andallowgreaterflexibilitybyusingtheclock

frequencyswitchingcapabilitiesoftheinternal

oscillator.AN892Fail-SafeMonitoringandClockFrequencySwitchingUsingthePIC16F684MONITORINGFORANEXTERNALAuthor:MichaelRyleeOSCILLATORFAILUREMicrochipTechnologyInc.OSCCON<3>(OSTS)indicateswhetherthedeviceisrunningfromtheprimaryorsecondaryoscillator.WhenINTRODUCTIONafailureontheprimaryoscillatorisdetected,theThisapplicationnotediscussestheFail-Safedevi