Data Sheet

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18
ETHERIO24TCPDATASHEET
©
2013ElexolPtyLtd Revision1.3
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WritePortPull‐upRegister
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WritePortAPullUpRegister
ASCII
Code
Bytes Data Function
%A 3  Enable
Writesdatatoport’sdirectionregister.
Lineswithacorrespondingbitvalueof1have
theirpullupresistorsturnedon,lineswith
abitvalueof0havetheirpullupresistors
turnedoff
ThepowerupdefaultforEnableis0;allpullupresistorsturnedoff
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Operation:ThiscommandaffectsalleightlinesofportAwhosedirectionisset
asaninput.TheEnable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’s
behaviourwithoutaffectingtheothersitisnecessarytostoretheoldvalueof
theregisterorreaditscurrentvaluebeforewritinganewvaluewithonlythe
correspondingbitschanged.Tosettheentireportwithpullupresistorsturned
onuseEnable=255or0xFFtoturnallthepullupresistorsoffuseEnable=0
or0x00toset0,1,2and3asonand4,5,6and7asoffuseEnable=15or
0x0F.
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WritePortBPullUpRegister
ASCII
Code
Bytes Data Function
%B 3  Enable
Writesdatatoport’sdirectionregister.
Lineswithacorrespondingbitvalueof1have
theirpullupresistorsturnedon,lineswith
abitvalueof0havetheirpullupresistors
turnedoff
ThepowerupdefaultforEnableis0;allpullupresistorsturnedoff
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Operation:SameoperationasWritePortAPullupRegisterbutimplementedonPort
B
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WritePortCPullUpRegister
ASCII
Code
Bytes Data Function
%C 3  Enable
Writesdatatoport’sdirectionregister.
Lineswithacorrespondingbitvalueof1have
theirpullupresistorsturnedon,lineswith
abitvalueof0havetheirpullupresistors
turnedoff
ThepowerupdefaultforEnableis0;allpullupresistorsturnedoff
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Operation:SameoperationasWritePortAPullUpRegisterbutimplementedonPort
C
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