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HT46R002 датащи(PDF) 53 Page - Holtek Semiconductor Inc

номер детали HT46R002
подробное описание детали  Cost-Effective A/D 8-Bit OTP MCU
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производитель  HOLTEK [Holtek Semiconductor Inc]
домашняя страница  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT46R002 датащи(HTML) 53 Page - Holtek Semiconductor Inc

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Rev. 1.21
52
April 11, 2017
Rev. 1.21
53
April 11, 2017
HT46R002/HT46R003
Cost-Effective A/D 8-Bit OTP MCU
HT46R002/HT46R003
Cost-Effective A/D 8-Bit OTP MCU
PCR3~PCR0 Bits HALT Instruction ADONB Bit ADC On/Off
=0
X
X
Off
> 0
X
0
On
> 0
X
1
Off
"X": Don’t care
A/D Converter On/Off Control
AlthoughtheA/DclocksourceisdeterminedbythesystemclockfSYS,andbybitsADCK2~ADCK0,
therearesomelimitationsonthemaximumA/Dclocksourcespeedthatcanbeselected.Asthe
recommendedrangeofpermissibleA/Dclockperiod,tAD,isfrom0.5μsto10μs,caremustbetaken
forsystemclockfrequencies.Forexample,ifthesystemclockoperatesatafrequencyof2MHzor
4MHz,theADCS2~ADCS0bitsshouldnotbesetto010Bor100Brespectively.Doingsowillgive
A/DclockperiodsthatarelessthantheminimumA/DclockperiodorgreaterthanthemaximumA/D
clockperiodwhichmayresultininaccurateA/Dconversionvalues.
Refertothefollowingtableforexamples,wherevaluesmarkedwithanasterisk*showwhere,
dependinguponthedevice,specialcaremustbetaken,asthevaluesmaybelessthanthespecified
minimumA/DClockPeriod.
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
2MHz
1μs
4μs
16μs*
500ns
2μs
8μs
Undefined
4MHz
500ns
2μs
8μs
250ns*
1μs
4μs
Undefined
8MHz
250ns*
1μs
4μs
125ns*
500ns
2μs
Undefined
12MHz
167ns*
667ns
2.67μs
83ns*
333ns*
1μs
Undefined
A/D Clock Period Examples
A/D Input Pins
AlloftheA/Danaloginputpinsarepin-sharedwiththeI/OpinsonPortA.BitsPCR3~PCR0in
theADCRregisterdeterminewhethertheinputpinsaresetasnormalinput/outputpinsorwhether
theyaresetasanaloginputs.Inthisway,pinscanbechangedunderprogramcontroltochangetheir
functionfromnormalI/Ooperationtoanaloginputsandviceversa.Pull-highresistors,whichare
setthroughregisterprogramming,applytotheinputpinsonlywhentheyareusedasnormalI/O
pins,ifsetasA/Dinputsthepull-highresistorswillbeautomaticallydisconnected.Notethatitis
notnecessarytofirstsettheA/DpinasaninputintheI/OportcontrolregisterstoenabletheA/D
inputaswhenthePCR3~PCR0bitsenableanA/Dinput,thestatusoftheportcontrolregisterwill
beoverridden.


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