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HT66F20 Datasheet(PDF) 115 Page - Holtek Semiconductor Inc

Part # HT66F20
Description  Enhanced A/D Flash Type 8-Bit MCU with EEPROM
PDF  298 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT66F20 Datasheet(HTML) 115 Page - Holtek Semiconductor Inc

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Rev. 1.90
114
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Rev. 1.90
115
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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
TMnC0 Register
Bit
7
6
5
4
3
2
1
0
Name
TnPAU
TnCK�
TnCK1
TnCK0
TnON
TnRP�
TnRP1
TnRP0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
POR
0
0
0
0
0
0
0
0
Bit7
TnPAU:TMnCounterPauseControl
0:Run
1:Pause
Thecountercanbepausedbysettingthisbithigh.Clearingthebittozerorestores
normalcounteroperation.WheninaPauseconditiontheTMwillremainpoweredup
andcontinuetoconsumepower.Thecounterwillretainitsresidualvaluewhenthisbit
changesfromlowtohighandresumecountingfromthisvaluewhenthebitchanges
toalowvalueagain.
Bit6~4
TnCK2~TnCK0:SelectTMnCounterclock
000:fSYS/4
001:fSYS
010:fH/16
011:fH/64
100:fTBC
101:Undefined
110:TCKnrisingedgeclock
111:TCKnfallingedgeclock
ThesethreebitsareusedtoselecttheclocksourcefortheTM.SelectingtheReserved
clockinputwilleffectivelydisabletheinternalcounter.Theexternalpinclocksource
canbechosentobeactiveontherisingorfallingedge.TheclocksourcefSYSisthe
systemclock,whilefHandfTBCareotherinternalclocks,thedetailsofwhichcanbe
foundintheoscillatorsection.
Bit3
TnON:TMnCounterOn/OffControl
0:Off
1:On
Thisbitcontrolstheoverallon/offfunctionoftheTM.Settingthebithighenablesthe
countertorun,clearingthebitdisablestheTM.Clearingthisbittozerowillstopthe
counterfromcountingandturnofftheTMwhichwillreduceitspowerconsumption.
Whenthebitchangesstatefromlowtohightheinternalcountervaluewillberesetto
zero,howeverwhenthebitchangesfromhightolow,theinternalcounterwillretain
itsresidualvalue.
IftheTMisintheCompareMatchOutputModethentheTMoutputpinwillbereset
toitsinitialcondition,asspecifiedbytheTnOCbit,whentheTnONbitchangesfrom
lowtohigh.
Bit2~0
TnRP2~TnRP0:TMnCCRP3-bitregister,comparedwiththeTMnCounterbit9~bit7
ComparatorPMatchPeriod
000:1024TMnclocks
001:128TMnclocks
010:256TMnclocks
011:384TMnclocks
100:512TMnclocks
101:640TMnclocks
110:768TMnclocks
111:896TMnclocks
ThesethreebitsareusedtosetupthevalueontheinternalCCRP3-bitregister,which
arethencomparedwiththeinternalcounter'shighestthreebits.Theresultofthis
comparisoncanbeselectedtocleartheinternalcounteriftheTnCCLRbitissetto
zero.SettingtheTnCCLRbittozeroensuresthatacomparematchwiththeCCRP
valueswillresettheinternalcounter.AstheCCRPbitsareonlycomparedwiththe
highestthreecounterbits,thecomparevaluesexistin128clockcyclemultiples.
Clearingallthreebitstozeroisineffectallowingthecountertooverflowatits
maximumvalue.



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