To Next Page

To Previous Page

Rev. 2.50 184 June 22, 2017 Rev. 2.50 185 June 22, 2017

HT66F20/HT66F30/HT66F40/HT66F50/HT66F60

HT66FU30/HT66FU40/HT66FU50/HT66FU60

A/D Flash MCU with EEPROM

HT66F20/HT66F30/HT66F40/HT66F50/HT66F60

HT66FU30/HT66FU40/HT66FU50/HT66FU60

A/D Flash MCU with EEPROM

Bit3 C1OS:Outputpathselect

0:C1Xpin

1:Internaluse

Thisisthecomparatoroutputpathselectcontrolbit.Ifthebitissetto"0"andthe

C1SELbitis"1"thecomparatoroutputisconnectedtoanexternalC1Xpin.Ifthe

bitissetto"1"ortheC1SELbitis"0"thecomparatoroutputsignalisonlyused

internallybythedeviceallowingthesharedcomparatoroutputpintoretainitsnormal

I/Ooperation.

Bit2~1 Unimplemented,readas“0”

Bit0 C1HYEN:HysteresisControl

0:Off

1:On

Thisisthehysteresiscontrolbitandifsethighwillapplyalimitedamountof

hysteresistothecomparator,asspeciedintheComparatorElectricalCharacteristics

table.Thepositivefeedbackinducedbyhysteresisreducestheeffectofspurious

switchingnearthecomparatorthreshold.

Comparator Interrupt

Eachalsopossessesitsowninterruptfunction.Whenanyoneoftheoutputbitchangesstate,its

relevantinterruptagwillbeset,andifthecorrespondinginterruptenablebitisset,thenajump

toitsrelevantinterruptvectorwillbeexecuted.NotethatitisthechangingstateoftheC0OUT

orC1OUTbitandnottheoutputpinwhichgeneratesaninterrupt.Ifthemicrocontrollerisinthe

SLEEPorIDLEModeandtheComparatorisenabled,theniftheexternalinputlinescausethe

Comparatoroutputtochangestate,theresultinggeneratedinterruptagwillalsogenerateawake-

up.Ifitisrequiredtodisableawake-upfromoccurring,thentheinterruptagshouldberstset

highbeforeenteringtheSLEEPorIDLEMode.

Programming Considerations

Ifthecomparatorisenabled,itwillremainactivewhenthemicrocontrollerenterstheSLEEPor

IDLEMode,howeverasitwillconsumeacertainamountofpower,theusermaywishtoconsider

disablingitbeforetheSLEEPorIDLEModeisentered.

AscomparatorpinsaresharedwithnormalI/OpinstheI/Oregistersforthesepinswillbereadas

zero(portcontrolregisteris"1")orreadasportdataregistervalue(portcontrolregisteris"0")ifthe

comparatorfunctionisenabled.

Holtek HT66F30 User Manual

Other manuals for Holtek HT66F30