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HT45F3W Datasheet(PDF) 104 Page - Holtek Semiconductor Inc

Part # HT45F3W
Description  HT45F3W
PDF  167 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT45F3W Datasheet(HTML) 104 Page - Holtek Semiconductor Inc

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Rev. 1.50
104
De�e��e� 01� �01�
Rev. 1.50
105
De�e��e� 01� �01�
HT45F3W
R-Type Blood Pressure Meter Flash MCU
HT45F3W
R-Type Blood Pressure Meter Flash MCU
Analog to Digital Converter – ADC
Theneedtointerfacetorealworldanalogsignalsisacommonrequirementformanyelectronic
systems.However,toproperlyprocessthesesignalsbyamicrocontroller,theymustfirstbe
convertedintodigitalsignalsbyA/Dconverters.ByintegratingtheA/Dconversionelectronic
circuitryintothemicrocontroller,theneedforexternalcomponentsisreducedsignificantlywiththe
correspondingfollow-onbenefitsoflowercostsandreducedcomponentspacerequirements.
A/D Overview
Thedevicecontainsamulti-channelanalogtodigitalconverter,channel0~3areforexternalsignal
input,channel4~7areforthePGAandBatteryDetectfunctions.
TheaccompanyingblockdiagramshowstheoverallinternalstructureoftheA/Dconverter,together
withitsassociatedregisters.
PB0
A/D Converter Structure
A/D Converter Data Registers – ADRL, ADRH
AstheinternalA/Dconverterprovidesa12bitdigitalconversationvalueitrequirestwodata
registers,ahighbyteregister,knownasADRH,andalowbyteregister,knownasADRL.Afterthe
conversionprocesstakesplace,theseregisterscanbedirectlyreadbythemicrocontrollertoobtain
thedigitisedconversionvalue.Forasingleconversionvalue,thatiswhentheACCMbitiszero,the
12bitconvertedvalueisstoredinbits0-11.Fortheconversionaccumulationmode,thatiswhenthe
ACCMbitishigh,thefull16-bitsareused,thereforethefull16-bitsareused.
ADRL Register
Bit
7
6
5
4
3
2
1
0
Na�e
D7
D�
D5
D4
D3
D�
D1
D0
R/W
R
R
R
R
R
R
R
R
POR
0
0
0
0
0
0
0
0
Bit7~0
D7~D0:ADCdataregisterbit7~bit0
ADRH Register
Bit
7
6
5
4
3
2
1
0
Na�e
D15
D14
D13
D1�
D11
D10
D9
D8
R/W
R
R
R
R
R
R
R
R
POR
0
0
0
0
0
0
0
0
Bit7~0
D15~D8:ADCdataregisterbit15~bit8
WhenbitACCMissetto1,D12toD15isvalid.



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