HT45F3820 datasheet(21/121 Pages) HOLTEK

21 / 121 page

Rev. 1.11

April 11, 2017

Rev. 1.11

April 11, 2017

HT45F3820

Ultrasonic Atomizer Flash MCU

HT45F3820

Ultrasonic Atomizer Flash MCU

Holtek e-Link Pins

EV Chip Pins

Pin Description

OCDSDA

On-chip Debug Support Data/Address input/output

OCDSCK

On-chip Debug Support Clock input

VDD

Power Supply

GND

VSS

Ground

RAM Data Memory

TheDataMemoryisavolatileareaof8-bitwideRAMinternalmemoryandisthelocationwhere

temporaryinformationisstored.

Structure

Dividedintotwosections,thefirstoftheseisanareaofRAM,knownastheSpecialPurposeData

Memory.Herearelocatedregisterswhicharenecessaryforcorrectoperationofthedevice.Many

oftheseregisterscanbereadfromandwrittentodirectlyunderprogramcontrol,however,some

remainprotectedfromusermanipulation.ThesecondareaofDataMemoryisknownastheGeneral

PurposeDataMemory,whichisreservedforgeneralpurposeuse.Alllocationswithinthisareaare

readandwriteaccessibleunderprogramcontrol.

TheoverallDataMemoryissubdividedintotwobanks.TheSpecialPurposeDataMemoryregistersare

accessibleinallbanks,withtheexceptionoftheEECregisterataddress40H,whichisonlyaccessible

inBank1.SwitchingbetweenthedifferentDataMemorybanksisachievedbysettingtheBankPointer

tothecorrectvalue.ThestartaddressoftheDataMemoryforthedeviceistheaddress00H.

Special Purpose Data Memory

General Purpose Data Memory

Address

Capacity

Address

Bank 0: 00H~7FH

Bank 1: 00H~7FH

64×8

Bank 0: 80H~BFH

Special Purpose

Data Memory

General Purpose

Data Memory

000H

07FH

080H

0BFH

Bank 1

Bank 0

EEC

Data Memory Structure

General Purpose Data Memory

Allmicrocontrollerprogramsrequireanareaofread/writememorywheretemporarydatacanbe

storedandretrievedforuselater.ItisthisareaofRAMmemorythatisknownasGeneralPurpose

DataMemory.ThisareaofDataMemoryisfullyaccessiblebytheuserprogramingforbothreading

andwritingoperations.Byusingthebitoperationinstructionsindividualbitscanbesetorresetunder

programcontrolgivingtheuseralargerangeofflexibilityforbitmanipulationintheDataMemory.

HT45F3820 Datasheet(PDF) 21 Page - Holtek Semiconductor Inc

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