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HT46R004 Datasheet(PDF) 53 Page - Holtek Semiconductor Inc

No. de pieza HT46R004
Descripción Electrónicos  Cost-Effective A/D 8-Bit OTP MCU
Download  84 Pages
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Fabricante Electrónico  HOLTEK [Holtek Semiconductor Inc]
Página de inicio  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT46R004 Datasheet(HTML) 53 Page - Holtek Semiconductor Inc

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Rev. 1.30
5�
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Rev. 1.30
53
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HT46R004
Cost-Effective A/D 8-Bit OTP MCU
fSYS
A/D Clock Period(tAD)
ADCS2,
ADCS1,
ADCS0
=000
((fSYS/2)
ADCS2,
ADCS1,
ADCS0
=001
(fSYS/8)
ADCS2,
ADCS1,
ADCS0
=010
(fSYS/32)
ADCS2,
ADCS1,
ADCS0
=100
(fSYS)
ADCS2,
ADCS1,
ADCS0
=101
(fSYS/4)
ADCS2,
ADCS1,
ADCS0
=110
(fSYS/16)
ADCS2,
ADCS1,
ADCS0
=011,111
1MHz
2μs
8μs
32μs
1μs
4μs
16μs*
Undefined
�MHz
1μs
4μs
16μs
500ns
2μs
8μs
Undefined
4MHz
500ns
2μs
8μs
250ns*
1μs
4μs
Undefined
8MHz
250ns*
1μs
4μs
125ns*
500ns
2μs
Undefined
1�MHz
167ns*
��7ns
2.67μs
83ns*
333ns*
1μs
Undefined
A/D Clock Period Examples
A/D Input Pins
AlloftheA/Danaloginputpinsarepin-sharedwiththeI/OpinsonPortAandPC.Bits
PCR7~PCR0intheADCR1registerdeterminewhethertheinputpinsaresetasnormalinput/output
pinsorwhethertheyaresetasanaloginputs.Inthisway,pinscanbechangedunderprogram
controltochangetheirfunctionfromnormalI/Ooperationtoanaloginputsandviceversa.Pull-high
resistors,whicharesetthroughregisterprogramming,applytotheinputpinsonlywhenthey
areusedasnormalI/Opins,ifsetasA/Dinputsthepull-highresistorswillbeautomatically
disconnected.NotethatitisnotnecessarytofirstsettheA/DpinasaninputintheI/Oportcontrol
registerstoenabletheA/DinputaswhenthePCR7~PCR0bitsenableanA/Dinput,thestatusofthe
portcontrolregisterwillbeoverridden.
Summary of A/D Conversion Steps
ThefollowingsummarizestheindividualstepsthatshouldbeexecutedinordertoimplementanA/D
conversionprocess.
• Step1
SelecttherequiredA/DconversionclockbycorrectlyprogrammingbitsADCS2~ADCS0inthe
ACSRregister.
• Step2
SelectwhichpinsaretobeusedasA/DinputsandconfigurethemasA/Dinputpinsbycorrectly
programmingthePCR7~PCR0bitsintheADCR1register.
• Step3
EnabletheA/DbyclearingtheADONBintheACSRregistertozero.
• Step4
SelectwhichchannelistobeconnectedtotheinternalA/Dconverterbycorrectlyprogramming
theACS2~ACS0bitswhicharealsocontainedintheregister.
• Step5
Iftheinterruptsaretobeused,theinterruptcontrolregistersmustbecorrectlyconfiguredto
ensuretheA/Dconverterinterruptfunctionisactive.Themasterinterruptcontrolbit,EMI,the
INTC0interruptcontrolregistermustbesetto“1”,theA/Dconverterinterruptbit,ADE,must
alsobesetto“1”.
• Step6
TheanalogtodigitalconversionprocesscannowbeinitializedbysettingtheSTARTbitin
theADCR0registerfromlowtohighandthenlowagain.Notethatthisbitshouldhavebeen
originallyclearedtozero.


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