Data Sheet

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16
ETHERIO24TCPDATASHEET
WritePortDirectionRegister
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WritePortADirectionRegister
ASCII
Code
Bytes Data Function
!A 3 Direction
Writesdatatoport’sdirectionregister.
Lineswithacorrespondingbitvalueof0are
setasoutputs,lineswithabitvalueof1
aresetasinputs
ThepowerupdefaultforDirectionis255settingalllinesasinputs
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Operation:ThiscommandaffectsalleightlinesofportA.TheDirectionvalueis
writtentotheentireportwitheachofthebitsinthebyteaffectingthe
correspondingI/Oline.TochangeasingleI/Olinewithoutaffectingtheothers
itisnecessarytostoretheoldvalueoftheportorreaditscurrentvalue
beforewritinganewvaluewithonlythecorrespondingbitschanged.Tosetthe
entireportasoutputsuseDirection=0tosetallasinputsuseDirection=255
toset0,1,2and3asinputsand4,5,6and7asoutputsuseDirection=15.
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WritePortBDirectionRegister
ASCII
Code
Bytes Data Function
!B 3 Direction
Writesdatatoportsdirectionregister.
Lineswithacorrespondingbitvalueof0are
setasoutputs,lineswithabitvalueof1
aresetasinputs
ThepowerupdefaultforDirectionis255settingalllinesasinputs
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Operation:SameoperationasWritePortADirectionRegisterbutimplementedon
PortB
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WritePortCDirectionRegister
ASCII
Code
Bytes Data Function
!C 3 Direction
Writesdatatoportsdirectionregister.
Lineswithacorrespondingbitvalueof0are
setasoutputs,lineswithabitvalueof1
aresetasinputs
ThepowerupdefaultforDirectionis255settingalllinesasinputs
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Operation:operationasWritePortADirectionRegisterbutimplementedonPortC
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©
2013ElexolPtyLtd Revision1.3
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