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HT48R002 Datasheet(PDF) 16 Page - Holtek Semiconductor Inc |
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HT48R002 Datasheet(HTML) 16 Page - Holtek Semiconductor Inc |
16 / 71 page Rev. 1.11 16 April 11, 2017 Rev. 1.11 17 April 11, 2017 HT48R002/HT48R003 Cost-Effective I/O 8-Bit OTP MCU HT48R002/HT48R003 Cost-Effective I/O 8-Bit OTP MCU RAM Data Memory TheDataMemoryisavolatileareaof8-bitwideRAMinternalmemoryandisthelocationwhere temporaryinformationisstored. Structure Dividedintotwosections,thefirstoftheseisanareaofRAMwherespecialfunctionregistersare located.Theseregistershavefixedlocationsandarenecessaryforcorrectoperationofthedevice. Manyoftheseregisterscanbereadfromandwrittentodirectlyunderprogramcontrol,however, someremainprotectedfromusermanipulation.ThesecondareaofDataMemoryisreservedfor generalpurposeuse.Alllocationswithinthisareaarereadandwriteaccessibleunderprogram control. ThetwosectionsofDataMemory,theSpecialPurposeandGeneralPurposeDataMemoryare locatedatconsecutivelocations.AllareimplementedinRAMandare8bitswidebutthelengthof eachmemorysectionisdictatedbythetypeofmicrocontrollerchosen.ThestartaddressoftheData Memoryforalldevicesistheaddress“00H”. Allmicrocontrollerprogramsrequireanareaofread/writememorywheretemporarydatacanbe storedandretrievedforuselater.ItisthisareaofRAMmemorythatisknownasGeneralPurpose DataMemory.ThisareaofDataMemoryisfullyaccessiblebytheuserprogramforbothreading andwritingoperations.Byusingthe“SET[m].i”and“CLR[m].i”instructionsindividualbitscan besetorresetunderprogramcontrolgivingtheuseralargerangeofflexibilityforbitmanipulation intheDataMemory. G ener al Pu r pos e R egi st er s S pec ia l Pu r pos e R egi st er s 02 H 03 H 40 H IA R1 MP 1 7F H 3F H 64 b y te s 00 H 01 H IA R0 MP 0 Data Memory Structure Note:MostoftheDataMemorybitscanbedirectlymanipulatedusingthe“SET[m].i”and “CLR[m].i”withtheexceptionofafewdedicatedbits.TheDataMemorycanalsobe accessedviathememorypointerregisters. |
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