HT66F20 datasheet(177/298 Pages) HOLTEK

177 / 298 page

Rev. 1.90

176

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Rev. 1.90

177

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HT66F20/HT66F30/HT66F40/HT66F50/HT66F60

HT66FU30/HT66FU40/HT66FU50/HT66FU60

Enhanced A/D Flash Type 8-Bit MCU with EEPROM

HT66F20/HT66F30/HT66F40/HT66F50/HT66F60

HT66FU30/HT66FU40/HT66FU50/HT66FU60

Enhanced A/D Flash Type 8-Bit MCU with EEPROM

A/D Input Pins

AlloftheA/Danaloginputpinsarepin-sharedwiththeI/OpinsonPortA,PE6,PF7,PF0orPF1

aswellasotherfunctions.TheACE11~ACE0bitsintheACERHandACERLregisters,determine

whethertheinputpinsaresetupasA/Dconverteranaloginputsorwhethertheyhaveother

functions.IftheACE11~ACE0bitsforitscorrespondingpinissethighthenthepinwillbesetupto

beanA/Dconverterinputandtheoriginalpinfunctionsdisabled.Inthisway,pinscanbechanged

underprogramcontroltochangetheirfunctionbetweenA/Dinputsandotherfunctions.Allpull-

highresistors,whicharesetupthroughregisterprogramming,willbeautomaticallydisconnectedif

thepinsaresetupasA/Dinputs.NotethatitisnotnecessarytofirstsetuptheA/Dpinasaninputin

thePAC,PECorPFCportcontrolregistertoenabletheA/DinputaswhentheACE11~ACE0bits

enableanA/Dinput,thestatusoftheportcontrolregisterwillbeoverridden.

TheA/Dconverterhasitsownreferencevoltagepin,VREF,howeverthereferencevoltagecan

alsobesuppliedfromthepowersupplypin,achoicewhichismadethroughtheVREFSbitinthe

ADCR1register.TheanaloginputvaluesmustnotbeallowedtoexceedthevalueofVREF.

PA 0/ AN 0

PF 1/ AN 11

1. 25 V

V 125E N

Bu ffe r

PB 5/ VR EF

VD D

VR EF S

V RE F

12- bi t A DC

B andgap

Re fe r enc e

Vo lt age

I npu t V ol t age

AC S4 ~A CS 0

A/D Input Structure

Summary of A/D Conversion Steps

Thefollowingsummarisestheindividualstepsthatshouldbeexecutedinordertoimplementan

A/Dconversionprocess.

• Step1

SelecttherequiredA/DconversionclockbycorrectlyprogrammingbitsADCK2~ADCK0inthe

ADCR1register.

• Step2

EnabletheA/DbyclearingtheADOFFbitintheADCR0registertozero.

• Step3

SelectwhichchannelistobeconnectedtotheinternalA/Dconverterbycorrectlyprogramming

theACS4~ACS0bitswhicharealsocontainedintheADCR1andADCR0register.

• Step4

SelectwhichpinsaretobeusedasA/Dinputsandconfigurethembycorrectlyprogrammingthe

ACE11~ACE0bitsintheACERHandACERLregisters.

• Step5

Iftheinterruptsaretobeused,theinterruptcontrolregistersmustbecorrectlyconfiguredto

ensuretheA/Dconverterinterruptfunctionisactive.Themasterinterruptcontrolbit,EMI,and

theA/Dconverterinterruptbit,EADI,mustbothbesethightodothis.

HT66F20 Datasheet(PDF) 177 Page - Holtek Semiconductor Inc

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