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HT45R4U датащи(PDF) 24 Page - Holtek Semiconductor Inc |
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HT45R4U датащи(HTML) 24 Page - Holtek Semiconductor Inc |
24 / 105 page Rev. 1.10 �4 �a��� 1�� �01� Rev. 1.10 �� �a��� 1�� �01� HT45R4U TinyPowerTM A/D Type e-Banking ASSP OTP MCU with LCD Special Function Register Description Toensuresuccessfuloperationofthemicrocontroller,certaininternalregistersareimplementedin theDataMemoryarea.Theseregistersensurecorrectoperationofinternalfunctionssuchastimers, interrupts,etc.,aswellasexternalfunctionssuchasI/OdatacontrolandA/Dconverteroperation. ThelocationoftheseregisterswithintheDataMemorybeginsattheaddress00H.AnyunusedData MemorylocationsbetweenthesespecialfunctionregistersandthepointwheretheGeneralPurpose Memorybeginsisreservedforfutureexpansionpurposes,attemptingtoreaddatafromthese locationswillreturnavalueof00H. Indirect Addressing Registers – IAR0, IAR1 TheIndirectAddressingRegisters,IAR0andIAR1,althoughhavingtheirlocationsinnormalRAM registerspace,donotactuallyphysicallyexistasnormalregisters.Themethodofindirectaddressing forRAMdatamanipulationusestheseIndirectAddressingRegistersandMemoryPointers,in contrasttodirectmemoryaddressing,wheretheactualmemoryaddressisspecified.Actionsonthe IAR0andIAR1registerswillresultinnoactualreadorwriteoperationtotheseregistersbutrather tothememorylocationspecifiedbytheircorrespondingMemoryPointers,MP0orMP1.Actingasa pair,IAR0andMP0cantogetheraccessdatafromBank0whiletheIAR1andMP1registerpaircan accessdatafromanybank.AstheIndirectAddressingRegistersarenotphysicallyimplemented, readingtheIndirectAddressingRegistersindirectlywillreturnaresultof″00H″andwritingtothe registersindirectlywillresultinnooperation. Memory Pointers – MP0, MP1 TwoMemoryPointers,knownasMP0andMP1areprovided.TheseMemoryPointersarephysically implementedintheDataMemoryandcanbemanipulatedinthesamewayasnormalregistersproviding aconvenientwaywithwhichtoaddressandtrackdata.WhenanyoperationtotherelevantIndirect AddressingRegistersiscarriedout,theactualaddressthatthemicrocontrollerisdirectedto,isthe addressspecifiedbytherelatedMemoryPointer.MP0,togetherwithIndirectAddressingRegister,IAR0, areusedtoaccessdatafromBank0,whileMP1andIAR1areusedtoaccessdatafromallbanks. ThefollowingexampleshowshowtoclearasectionoffourRAMlocationsalreadydefinedas locationsadres1toadres4. Indirect Addressing Program Example data .section ′data′ adres1 db ? adres2 db ? Adres3 db ? adres4 db ? block db ? code .section at 0 ′code′ org 00h start: mov a,04h ; setup size of block mov block,a mov a,offset adres1 ; Accumulator loaded with first RAM address mov mp0,a ; setup memory pointer with first RAM address loop: clr IAR0 ; clear the data at address defined by MP0 inc mp0 ; increment memory pointer sdz block ; check if last memory location has been cleared jmp loop continue: Theimportantpointtonotehereisthatintheexampleshownabove,noreferenceismadetospecific RAMaddresses. |
Аналогичный номер детали - HT45R4U |
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Аналогичное описание - HT45R4U |
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