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HT46R003B Folha de dados(PDF) 48 Page - Holtek Semiconductor Inc

Nome de Peças HT46R003B
Descrição Electrónicos  Cost-Effective A/D 8-bit OTP MCU
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Fabricante Electrônico  HOLTEK [Holtek Semiconductor Inc]
Página de início  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT46R003B Folha de dados(HTML) 48 Page - Holtek Semiconductor Inc

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HT46R003B
Cost-Effective A/D 8-bit OTP MCU
HT46R003B
Cost-Effective A/D 8-bit OTP MCU
A/D Operation
TheSTARTbitintheregisterisusedtostartandresettheA/Dconverter.Whenthemicrocontroller
setsthisbitfromlowtohighandthenlowagain,ananalogtodigitalconversioncyclewillbe
initiated.WhentheSTARTbitisbroughtfromlowtohighbutnotlowagain,theEOCBbitinthe
ADCRregisterwillbesettoa“1”andtheanalogtodigitalconverterwillbereset.ItistheSTART
bitthatisusedtocontroltheoverallstartoperationoftheinternalanalogtodigitalconverter.
TheEOCBbitintheADCRregisterisusedtoindicatewhentheanalogtodigitalconversionprocess
iscomplete.Thisbitwillbeautomaticallysetto“0”bythemicrocontrollerafteraconversioncycle
hasended.Inaddition,thecorrespondingA/Dinterruptrequestflagwillbesetintheinterrupt
controlregister,andiftheinterruptsareenabled,anappropriateinternalinterruptsignalwillbe
generated.ThisA/DinternalinterruptsignalwilldirecttheprogramflowtotheassociatedA/D
internalinterruptaddressforprocessing.IftheA/Dinternalinterruptisdisabled,themicrocontroller
canbeusedtopolltheEOCBbitintheADCRregistertocheckwhetherithasbeenclearedasan
alternativemethodofdetectingtheendofanA/Dconversioncycle.
TheclocksourcefortheA/Dconverter,whichoriginatesfromthesystemclockfSYS,isfirstdivided
byadivisionratio,thevalueofwhichisdeterminedbytheADCS2,ADCS1andADCS0bitsinthe
ACSRregister.
TheA/Dconverteroverallon/offcontrolisafunctionofboththeADONBbitintheACSRregister
andthePCR4~PCR0bitsintheADPCRregisterasshowninthetable.EithertheADONBbit
clearedtozeroorthePCR4~PCR0bitssettoazerovaluewillswitchofftheA/Dconverter.These
areimportantconsiderationinpowersensitiveapplicationsandmustbetakenintoaccountifpower
consumptionistobeminimised.Asthetableillustrates,executionoftheHALTinstructionhasno
effectontheA/Dconverteron/offcontrolandsubsequentlyitspowerconsumption.
PCR4~PCR0 Bits
HALT Instruction
ADONB Bit
A/D Converter 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,andbybitsADCS2,ADCS1
andADCS0,therearesomelimitationsonthemaximumA/Dclocksourcespeedthatcanbe
selected.AstheminimumvalueofpermissibleA/Dclockperiod,tAD,is0.5μs~10μs,caremustbe
takenforsystemclockspeedsinexcessof4MHz.Forsystemclockspeedsinexcessof4MHz,the
ADCS2,ADCS1andADCS0bitsshouldnotbesetto“000”.DoingsowillgiveA/Dclockperiods
thatarelessthantheminimumA/DclockperiodwhichmayresultininaccurateA/Dconversion
values.
Refertothefollowingtableforexamples,wherevaluesmarkedwithanasterisk*showwhere,
dependinguponthedevice,specialcaremustbetaken,asthevaluesmaybelessthanthespecified
minimumA/DClockPeriod.


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