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HT48R068B Datenblatt(PDF) 45 Page - Holtek Semiconductor Inc |
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HT48R068B Datenblatt(HTML) 45 Page - Holtek Semiconductor Inc |
45 / 118 page Rev. 1.30 44 �e���a�� 0�� �01� Rev. 1.30 4� �e���a�� 0�� �01� HT48R068B/HT48R069B Enhanced I/O 8-Bit OTP MCU HT48R068B/HT48R069B Enhanced I/O 8-Bit OTP MCU Register Power-on Reset RES or LVR Reset (Normal Operation) RES or LVR Reset (Idle/Sleep) WDT Time-out (Normal Operation) WDT Time-out (Idle/Sleep) DAL ● ● 0000 –––– 0000 –––– 0000 –––– 0000 –––– ���� –––– DAH ● ● 0000 0000 0000 0000 0000 0000 0000 0000 ���� ���� VOL ● ● 0000 –––– 0000 –––– 0000 –––– 0000 –––– ���� –––– LVDC ● ● ––00 –––– ––00 –––– ––00 –––– ––00 –––– ––�� –––– Input/Output Ports HoltekmicrocontrollersofferconsiderableflexibilityontheirI/Oports.Mostpinscanhaveeitheran inputoroutputdesignationunderuserprogramcontrol.Additionally,astherearepull-highresistors andwake-upsoftwareconfigurations,theuserisprovidedwithanI/Ostructuretomeettheneedsof awiderangeofapplicationpossibilities. Forinputoperation,theseportsarenon-latching,whichmeanstheinputsmustbereadyattheT2 risingedgeofinstruction"MOVA,[m]",wheremdenotestheportaddress.Foroutputoperation,all thedataislatchedandremainsunchangeduntiltheoutputlatchisrewritten. Pull-high Resistors Manyproductapplicationsrequirepull-highresistorsfortheirswitchinputsusuallyrequiringtheuse ofanexternalresistor.Toeliminatetheneedfortheseexternalresistors,whenconfiguredasaninput havethecapabilityofbeingconnectedtoaninternalpull-highresistor.Thesepull-highresistorsare selectableviaaregisterknownasPAPU~PHPUlocatedintheDataMemory.Thepull-highresistors areimplementedusingweakPMOStransistors.NotethatpinPA7doesnothaveapull-highresistor selection. Port A Wake-up IftheHALTinstructionisexecuted,thedevicewillentertheIdle/SleepMode,wherethesystem clockwillstopresultinginpowerbeingconserved,afeaturethatisimportantforbatteryandother low-powerapplications. Variousmethodsexisttowake-upthemicrocontroller,oneofwhichistochangethelogiccondition ononeofthePA0~PA7pinsfromhightolow.AfteraHALTinstructionforcesthemicrocontroller intoenteringtheIdle/SleepMode,theprocessorwillremainidleorinalow-powerstateuntilthe logicconditionoftheselectedwake-uppinonPortAchangesfromhightolow.Thisfunctionis especiallysuitableforapplicationsthatcanbewokenupviaexternalswitches.NotethatpinsPA0 toPA7canbeselectedindividuallytohavethiswake-upfeatureusinganinternalregisterknownas PAWK,locatedintheDataMemory. |
Ähnliche Teilenummer - HT48R068B_15 |
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Ähnliche Beschreibung - HT48R068B_15 |
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