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【应用笔记】使用MAXII和MAX3000A器件扩展微控制器I/O口(UsingMAXII&MAX3000ADevicesasaMicrocontrollerI/OExpander)ManymicrocontrollerandmicroprocessorslimitI/Oportsandpinstoconservepincountsandreducepackagesizes.Formanymicrocontroller-(e.g.,PIC,8051,andSX)ormicroprocessor-basedsystems,thesystemdesignrequiresmoreI/Opinswithoutchangingthemicrocontroller.ToincreasethenumberofI/Opinswithoutchangingthemicrocontroller,I/Oexpansionprovidesasolution.Withupto272I/OpinsandMultiVoltTMI/Ocapability,Altera®MAX®IIandMAX3000AdevicesallowyoutoimplementmicrocontrollerI/Oexpansioninmicrocontroller-ormicroprocessorbasedsystems.ThisapplicationnoteexplainshowtoimplementamicrocontrollerI/OexpanderinMAXIIandMAX3000Adevices.UsingMAXII&MAX3000ADevicesasaMicrocontrollerI/OExpanderMarch2004,ver2.0ApplicationNote265IntroductionManymicrocontrollerandmicroprocessorslimitI/Oportsandpinstoconservepincountsandreducepackagesizes.Formanymicrocontroller-(e.g.,PIC,8051,andSX)ormicroprocessor-basedsystems,thesystemdesignrequiresmoreI/Opinswithoutchangingthemicrocontroller.ToincreasethenumberofI/Op……