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HT45F2020 Datasheet(PDF) 17 Page - Holtek Semiconductor Inc

Part # HT45F2020
Description  Sound Effect Generator Flash MCU
PDF  85 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT45F2020 Datasheet(HTML) 17 Page - Holtek Semiconductor Inc

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Rev. 1.00
16
April 11, 2017
Rev. 1.00
17
April 11, 2017
HT45F2020/HT45F2022
Sound Effect Generator Flash MCU
HT45F2020/HT45F2022
Sound Effect Generator Flash MCU
In Circuit Programming – ICP
TheprovisionofFlashtypeProgramMemoryprovidestheuserwithameansofconvenientandeasy
upgradesandmodificationstotheirprogramsonthesamedevice.Asanadditionalconvenience,
Holtekhasprovidedameansofprogrammingthemicrocontrollerin-circuitusinga4-pininterface.
Thisprovidesmanufacturerswiththepossibilityofmanufacturingtheircircuitboardscompletewith
aprogrammedorun-programmedmicrocontroller,andthenprogrammingorupgradingtheprogram
atalaterstage.Thisenablesproductmanufacturerstoeasilykeeptheirmanufacturedproducts
suppliedwiththelatestprogramreleaseswithoutremovalandre-insertionofthedevice.
TheHoltekFlashMCUtoWriterProgrammingPincorrespondencetableisasfollows:
Holtek Writer Pins
MCU Programming Pins
Pin Description
ICPDA
PA0
Programming Serial Data/Address
ICPCK
PA2
Programming Clock
VDD
VDD
Power Supply
VSS
VSS
Ground
TheProgramMemorycanbeprogrammedseriallyin-circuitusingthis4-wireinterface.Data
isdownloadedanduploadedseriallyonasinglepinwithanadditionallinefortheclock.Two
additionallinesarerequiredforthepowersupply.Thetechnicaldetailsregardingthein-circuit
programmingofthedevicearebeyondthescopeofthisdocumentandwillbesuppliedin
supplementaryliterature.
Duringtheprogrammingprocess,theusercantakecontroloftheICPDAandICPCKpinsfordata
andclockprogrammingpurposestoensurethatnootheroutputsareconnectedtothesetwopins.
*
*
Writer_VDD
ICPDA
ICPCK
Writer_VSS
To other Circuit
VDD
PA0
PA2
VSS
Writer Connector
Signals
MCU Programming
Pins
Note:*mayberesistororcapacitor.Theresistanceof*mustbegreaterthan1kΩorthecapacitance
of*mustbelessthan1nF.



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