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HT66F005 데이터시트(PDF) 76 Page - Holtek Semiconductor Inc

부품명 HT66F005
상세설명  Cost-Effective A/D Flash MCU with EEPROM
PDF  109 Pages
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제조업체  HOLTEK [Holtek Semiconductor Inc]
홈페이지  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT66F005 데이터시트(HTML) 76 Page - Holtek Semiconductor Inc

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HT66F005/HT66F006
Cost-Effective A/D Flash MCU with EEPROM
HT66F005/HT66F006
Cost-Effective A/D Flash MCU with EEPROM
fSYS
A/D Clock Period (tADCK)
ADCK2,
ADCK1,
ADCK0
=000
(fSYS)
ADCK2,
ADCK1,
ADCK0
=001
(fSYS/2)
ADCK2,
ADCK1,
ADCK0
=010
(fSYS/4)
ADCK2,
ADCK1,
ADCK0
=011
(fSYS/8)
ADCK2,
ADCK1,
ADCK0
=100
(fSYS/16)
ADCK2,
ADCK1,
ADCK0
=101
(fSYS/32)
ADCK2,
ADCK1,
ADCK0
=110
(fSYS/64)
ADCK2,
ADCK1,
ADCK0
=111
1MHz
1μs
2μs
4μs
8μs
16μs*
32μs*
64μs*
Undefined
�MHz
500ns
1μs
2μs
4μs
8μs
16μs*
32μs*
Undefined
4MHz
�50ns*
500ns
1μs
2μs
4μs
8μs
16μs*
Undefined
8MHz
1�5ns*
�50ns*
500ns
1μs
2μs
4μs
8μs
Undefined
1�MHz
83ns*
16�ns*
333ns*
66�ns
1.33μs
2.67μs
5.33μs
Undefined
A/D Clock Period Examples
Controllingthepoweron/offfunctionoftheA/Dconvertercircuitryisimplementedusingthe
ADOFFbitintheADCR0register.ThisbitmustbezerotopowerontheA/Dconverter.Whenthe
ADOFFbitisclearedtozerotopowerontheA/Dconverterinternalcircuitryacertaindelay,as
indicatedinthetimingdiagram,mustbeallowedbeforeanA/Dconversionisinitiated.Evenifno
pinsareselectedforuseasA/DinputsbyclearingtheACE3~ACE0bitsintheACERregister,if
theADOFFbitiszerothensomepowerwillstillbeconsumed.Inpowerconsciousapplicationsit
isthereforerecommendedthattheADOFFissethightoreducepowerconsumptionwhentheA/D
converterfunctionisnotbeingused.
ThereferencevoltagesupplytotheA/DConvertercanbesuppliedfromeitherthepositivepower
supplypin,VDD,orfromanexternalreferencesourcessuppliedonpinVREF.Thedesiredselection
ismadeusingtheVREFSbit.AstheVREFpinispin-sharedwithotherfunctions,whentheVREFS
bitissethigh,theVREFpinfunctionwillbeselectedandtheotherpinfunctionswillbedisabled
automatically.
A/D Input Pins
AlloftheA/Danaloginputpinsarepin-sharedwiththeI/OpinsonPA3~PA0aswellasother
functions.TheACE3~ACE0bitsintheACERregisterdetermineswhethertheinputpinsaresetup
asA/Dconverteranaloginputsorwhethertheyhaveotherfunctions.IftheACE3~ACE0bitsforits
correspondingpinissethighthenthepinwillbesetuptobeanA/Dconverterinputandtheoriginal
pinfunctionsdisabled.Inthisway,pinscanbechangedunderprogramcontroltochangetheir
functionbetweenA/Dinputsandotherfunctions.Allpull-highresistors,whicharesetupthrough
registerprogramming,willbeautomaticallydisconnectedifthepinsaresetupasA/Dinputs.Note
thatitisnotnecessarytofirstsetuptheA/DpinasaninputinthePACportcontrolregistertoenable
theA/DinputaswhentheACE3~ACE0bitsenableanA/Dinput,thestatusoftheportcontrol
registerwillbeoverridden.
TheA/DconverterhasitsownreferencevoltagepinVREFhoweverthereferencevoltagecan
alsobesuppliedfromthepowersupplypin,achoicewhichismadethroughtheVREFSbitinthe
ADCR1register.TheanaloginputvaluesmustnotbeallowedtoexceedthevalueofVREF.



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