BS83A04A-3/BS83A04A-4
8-bit Touch Key Flash MCU
I/O Pin Structures
TheꢀaccompanyingꢀdiagramsꢀillustrateꢀtheꢀinternalꢀstructuresꢀofꢀsomeꢀgenericꢀI/Oꢀpinꢀtypes.ꢀAsꢀ
theꢀexactꢀlogicalꢀconstructionꢀofꢀtheꢀI/Oꢀpinꢀwillꢀdifferꢀfromꢀtheseꢀdrawings,ꢀtheyꢀareꢀsuppliedꢀasꢀaꢀ
guideꢀonlyꢀtoꢀassistꢀwithꢀtheꢀfunctionalꢀunderstandingꢀofꢀtheꢀI/Oꢀpins.ꢀTheꢀwideꢀrangeꢀofꢀpin-sharedꢀ
structuresꢀdoesꢀnotꢀpermitꢀallꢀtypesꢀtoꢀbeꢀshown.
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Generic Input/Output Ports
Programming Considerations
Withinꢀtheꢀuserꢀprogram,ꢀoneꢀofꢀtheꢀthingsꢀfirstꢀtoꢀconsiderꢀisꢀportꢀinitialisation.ꢀAfterꢀaꢀreset,ꢀallꢀ
ofꢀtheꢀI/Oꢀdataꢀandꢀportꢀcontrolꢀregistersꢀwillꢀbeꢀsetꢀtoꢀhigh.ꢀThisꢀmeansꢀthatꢀallꢀI/Oꢀpinsꢀwillꢀbeꢀ
defaultedꢀtoꢀanꢀinputꢀstate,ꢀtheꢀlevelꢀofꢀwhichꢀdependsꢀonꢀtheꢀotherꢀconnectedꢀcircuitryꢀandꢀwhetherꢀ
pull-highꢀselectionsꢀhaveꢀbeenꢀchosen.ꢀIfꢀtheꢀportꢀcontrolꢀregistersꢀareꢀthenꢀprogrammedꢀtoꢀsetupꢀ
someꢀpinsꢀasꢀoutputs,ꢀtheseꢀoutputꢀpinsꢀwillꢀhaveꢀanꢀinitialꢀhighꢀoutputꢀvalueꢀunlessꢀtheꢀassociatedꢀ
portꢀdataꢀregistersꢀareꢀfirstꢀprogrammed.ꢀSelectingꢀwhichꢀpinsꢀareꢀinputsꢀandꢀwhichꢀareꢀoutputsꢀcanꢀ
beꢀachievedꢀbyte-wideꢀbyꢀloadingꢀtheꢀcorrectꢀvaluesꢀintoꢀtheꢀappropriateꢀportꢀcontrolꢀregisterꢀorꢀ
byꢀprogrammingꢀindividualꢀbitsꢀinꢀtheꢀportꢀcontrolꢀregisterꢀusingꢀtheꢀ"SETꢀ[m].i"ꢀandꢀ"CLRꢀ[m].i"ꢀ
instructions.ꢀNoteꢀthatꢀwhenꢀusingꢀtheseꢀbitꢀcontrolꢀinstructions,ꢀaꢀread-modify-writeꢀoperationꢀtakesꢀ
place.ꢀTheꢀmicrocontrollerꢀmustꢀfirstꢀreadꢀinꢀtheꢀdataꢀonꢀtheꢀentireꢀport,ꢀmodifyꢀitꢀtoꢀtheꢀrequiredꢀnewꢀ
bitꢀvaluesꢀandꢀthenꢀrewriteꢀthisꢀdataꢀbackꢀtoꢀtheꢀoutputꢀports.
PortꢀAꢀhasꢀtheꢀadditionalꢀcapabilityꢀofꢀprovidingꢀwake-upꢀfunctions.ꢀWhenꢀtheꢀdeviceꢀisꢀinꢀtheꢀ
SLEEPꢀorꢀIDLEꢀMode,ꢀvariousꢀmethodsꢀareꢀavailableꢀtoꢀwakeꢀtheꢀdeviceꢀup.ꢀOneꢀofꢀtheseꢀisꢀaꢀhighꢀ
toꢀlowꢀtransitionꢀofꢀanyꢀofꢀtheꢀPortꢀAꢀpins.ꢀSingleꢀorꢀmultipleꢀpinsꢀonꢀPortꢀAꢀcanꢀbeꢀsetupꢀtoꢀhaveꢀthisꢀ
function.
Rev. 1.00
ꢇ9
�eꢀꢁꢂaꢁꢃ ꢄꢅꢆ ꢄ01ꢇ
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