HT66F005 datasheet(77/109 Pages) HOLTEK

77 / 109 page

Rev. 1.30

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Rev. 1.30

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HT66F005/HT66F006

Cost-Effective A/D Flash MCU with EEPROM

HT66F005/HT66F006

Cost-Effective A/D Flash MCU with EEPROM

PA 0/ AN 0

PA 3/ AN 3

1. 25 V

V 125E N

Bu ffe r

PA 1/ 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

In pu t V ol t age

AC S4 , AC S1 ~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,ACS1~ACS0bitswhicharealsocontainedintheADCR1andADCR0register.

• Step4

SelectwhichpinsaretobeusedasA/Dinputsandconfigurethembycorrectlyprogrammingthe

ACE3~ACE0bitsintheACERregister.

• Step5

Iftheinterruptsaretobeused,theinterruptcontrolregistersmustbecorrectlyconfiguredto

ensuretheA/Dconverterinterruptfunctionisactive.Themasterinterruptcontrolbit,EMI,and

theA/Dconverterinterruptbit,ADE,mustbothbesethightodothis.

• Step6

TheanalogtodigitalconversionprocesscannowbeinitialisedbysettingtheSTARTbitin

theADCR0registerfromlowtohighandthenlowagain.Notethatthisbitshouldhavebeen

originallyclearedto0.

• Step7

Tocheckwhentheanalogtodigitalconversionprocessiscomplete,theEOCBbitintheADCR0

registercanbepolled.Theconversionprocessiscompletewhenthisbitgoeslow.Whenthis

occurstheA/DdataregisterADRLandADRHcanbereadtoobtaintheconversionvalue.Asan

alternativemethod,iftheinterruptsareenabledandthestackisnotfull,theprogramcanwaitfor

anA/Dinterrupttooccur.

Note:Whencheckingfortheendoftheconversionprocess,ifthemethodofpollingtheEOCB

bitintheADCR0registerisused,theinterruptenablestepabovecanbeomitted.

Theaccompanyingdiagramshowsgraphicallythevariousstagesinvolvedinananalogtodigital

conversionprocessanditsassociatedtiming.AfteranA/Dconversionprocesshasbeeninitiated

bytheapplicationprogram,themicrocontrollerinternalhardwarewillbegintocarryoutthe

conversion,duringwhichtimetheprogramcancontinuewithotherfunctions.Thetimetakenforthe

A/Dconversionis16tADCKwheretADCKisequaltotheA/Dclockperiod.

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