Holtek BS82B12A-3 - Inte�Nal RC Oscillato� - HIRC; Inte�Nal �2 Khz Oscillato� - LIRC

Rev. 1.20 46 January 23, 2015 Rev. 1.20 47 January 23, 2015
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch Key 8-Bit Flash MCU with LED/LCD Driver
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch Key 8-Bit Flash MCU with LED/LCD Driver


   

 




 


 


 









   



 
 
  



Note:TheLXToscillatorisonlyfortheBS82C16A-3andBS82D20A-3.
System Clock Congurations
Internal RC Oscillator – HIRC
TheinternalRCoscillatorisafullyintegratedsystemoscillatorrequiringnoexternalcomponents.
TheinternalRCoscillatorhasapowerondefaultfrequencyof8MHzbutcanbeselectedtobe
either8MHz,12MHzor16MHzviaacongurationoptionandtheHIRCS1andHIRCS0bitsin
theCTRLregister.Devicetrimmingduringthemanufacturingprocessandtheinclusionofinternal
frequencycompensationcircuitsareusedtoensurethattheinuenceofthepowersupplyvoltage,
temperatureandprocessvariationsontheoscillationfrequencyareminimised.
Internal 32kHz Oscillator – LIRC
TheInternal32kHzSystemOscillatorisalowfrequencyoscillator.ItisafullyintegratedRC
oscillatorwithatypicalfrequencyof32kHzat5V,requiringnoexternalcomponentsforits
implementation.Devicetrimmingduringthemanufacturingprocessandtheinclusionofinternal
frequencycompensationcircuitsareusedtoensurethattheinuenceofthepowersupplyvoltage,
temperatureandprocessvariationsontheoscillationfrequencyareminimised.