HT48R002 datasheet(13/71 Pages) HOLTEK

13 / 71 page

Rev. 1.11

April 11, 2017

Rev. 1.11

April 11, 2017

HT48R002/HT48R003

Cost-Effective I/O 8-Bit OTP MCU

HT48R002/HT48R003

Cost-Effective I/O 8-Bit OTP MCU

Program Memory

TheProgramMemoryisthelocationwheretheusercodeorprogramisstored.Thedeviceis

suppliedwithOne-TimeProgrammable,OTP,memorywhereuserscanprogramtheirapplication

codeintothedevice.Byusingtheappropriateprogrammingtools,OTPdevicesofferusersthe

flexibilitytofreelydeveloptheirapplicationswhichmaybeusefulduringdebugorforproducts

requiringfrequentupgradesorprogramchanges.

Structure

TheProgramMemoryhasacapacityof1k×14bits.TheProgramMemoryisaddressedbythe

ProgramCounterandalsocontainsdata,tableinformationandinterruptentriesinformation.Table

datawhichcanbesetinanylocationwithintheProgramMemoryisaddressedbyseparatetable

pointerregisters.

: U nus ed ,r ead as " 00 "

De vi ce i ni ti al p ro gr am

Ex te ma l In te rr up t

Ti me r 0 I nt er ru pt

00 H

04 H

08 H

14 bi ts

3 FFH

Program Memory Structure

Special Vectors

WithintheProgramMemory,certainlocationsarereservedfortheresetandinterrupts.

Reset Vector

Thisvectorisreservedforusebythedeviceresetforprograminitialization.Afteradeviceresetis

initiated,theprogramwilljumptothislocationandbeginexecution.

External interrupt vector

Thisvectorisusedbytheexternalinterrupt.Iftheexternalinterruptpinonthedevicereceivesan

edgetransition,theprogramwilljumptothislocationandbeginexecutioniftheexternalinterruptis

enabledandthestackisnotfull.Theexternalinterruptactiveedgetransitiontype,whetherhighto

low,lowtohighorbothisspecifiedintheCTRL1register.

Timer/Event counter 0 interrupt vector

ThisinternalvectorisusedbytheTimer/EventCounter.IfaTimer/EventCounteroverflowoccurs,

theprogramwilljumptoitsrespectivelocationandbeginexecutioniftheassociatedTimer/Event

Counter0interruptisenabledandthestackisnotfull.

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