HT66F20 datasheet(178/298 Pages) HOLTEK

178 / 298 page

Rev. 1.90

178

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Rev. 1.90

179

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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

• Step6

TheanalogtodigitalconversionprocesscannowbeinitialisedbysettingtheSTARTbitin

theADCRregisterfromlowtohighandthenlowagain.Notethatthisbitshouldhavebeen

originallyclearedtozero.

• Step7

Tocheckwhentheanalogtodigitalconversionprocessiscomplete,theEOCBbitintheADCR0

registercanbepolled.Theconversionprocessiscompletewhenthisbitgoeslow.Whenthis

occurstheA/DdataregistersADRLandADRHcanbereadtoobtaintheconversionvalue.Asan

alternativemethod,iftheinterruptsareenabledandthestackisnotfull,theprogramcanwaitfor

anA/Dinterrupttooccur.

Note:Whencheckingfortheendoftheconversionprocess,ifthemethodofpollingtheEOCB

bitintheADCR0registerisused,theinterruptenablestepabovecanbeomitted.

Theaccompanyingdiagramshowsgraphicallythevariousstagesinvolvedinananalogtodigital

conversionprocessanditsassociatedtiming.AfteranA/Dconversionprocesshasbeeninitiated

bytheapplicationprogram,themicrocontrollerinternalhardwarewillbegintocarryoutthe

conversion,duringwhichtimetheprogramcancontinuewithotherfunctions.Thetimetakenforthe

A/Dconversionis16tADCKwheretADCKisequaltotheA/Dclockperiod.

t AD C

A/ D c onv er si on ti me

00011B

00010B

ST AR T

EO CB

AC S4 ~A CS 0

Po we r- on

Re se t

E nd of A /D

c onv er si on

1: D ef i ne por t c on fi gur at io n

2: S el ec t anal og ch a nnel

St ar t of A /D

c onv er si on

Re se t A/ D

c onv er te r

A/ D sa mp li ng t im e

t AD S

00000B

St ar t o f A /D

c onv er si on

Re se t A/ D

c onv er te r

00001B

St ar t o f A /D

c onv er si on

Re se t A/ D

c onv er te r

E nd of A /D

c onv er si on

A/ D sa mp li ng t im e

t AD S

of f

t ON 2S T

t AD C

A/ D c onv er si on ti me

of f

AD OF F

AD C M odul e

A/D Conversion Timing

HT66F20 Datasheet(PDF) 178 Page - Holtek Semiconductor Inc

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