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HT48R002 Datasheet(PDF) 18 Page - Holtek Semiconductor Inc

Part # HT48R002
Description  Cost-Effective I/O 8-Bit OTP MCU
Download  71 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT48R002 Datasheet(HTML) 18 Page - Holtek Semiconductor Inc

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Rev. 1.11
18
April 11, 2017
Rev. 1.11
19
April 11, 2017
HT48R002/HT48R003
Cost-Effective I/O 8-Bit OTP MCU
HT48R002/HT48R003
Cost-Effective I/O 8-Bit OTP MCU
Special Function Registers
Toensuresuccessfuloperationofthemicrocontroller,certaininternalregistersareimplementedin
theDataMemoryarea.Theseregistersensurecorrectoperationofinternalfunctionssuchastimer,
interrupts,etc.,aswellasexternalfunctionssuchasI/Odatacontrol.Thelocationsoftheseregisters
withintheDataMemorybeginattheaddressof“00H”.AnyunusedDataMemorylocations
betweenthesespecialfunctionregistersandthepointwheretheGeneralPurposeMemorybeginsis
reservedandattemptingtoreaddatafromtheselocationswillreturnavalueof“00H”.
Indirect Addressing Registers – IAR0, IAR1
TheIndirectAddressingRegisters,IAR0andIAR1,althoughhavingtheirlocationsinnormalRAM
register,donotactuallyphysicallyexistasnormalregisters.Themethodofindirectaddressing
forRAMdatamanipulationisusingtheseIndirectAddressingRegistersandMemoryPointers,in
contrasttodirectmemoryaddressing,wheretheactualmemoryaddressisspecified.Actionson
theIAR0andIAR1registerswillresultinnoactualreadorwriteoperationtotheseregistersbut
rathertothememorylocationspecifiedbytheircorrespondingMemoryPointers,MP0orMP1.As
theIndirectAddressingRegistersarenotphysicallyimplemented,readingtheIndirectAddressing
Registersindirectlywillreturnaresultof“00H”andwritingtotheregistersindirectlywillresultin
nooperation.
Memory Pointers – MP0, MP1
TwoMemoryPointers,knownasMP0andMP1areprovided.TheseMemoryPointersare
physicallyimplementedintheDataMemoryandcanbemanipulatedinthesamewayasnormal
registersprovidingaconvenientwaywithwhichtoindirectlyaddressandtrackdata.Whenany
operationtotherelevantIndirectAddressingRegistersiscarriedout,theactualaddresswhichthe
microcontrollerisdirectedtoistheaddressspecifiedbytherelatedMemoryPointer.Notethatfor
thisdevice,theMemoryPointers,MP0andMP1,areboth8-bitregistersandusedtoaccesstheData
MemorytogetherwiththeircorrespondingindirectaddressingregistersIAR0andIAR1.
ThefollowingexampleshowshowtoclearasectionoffourDataMemorylocationsalreadydefined
aslocationsadres1toadres4.
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
; set size of block
mov block,a
mov a,offset adres1
; Accumulator loaded with first RAM address
mov mp0,a
; set 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
DataMemoryaddresses.


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