HT66F20 datasheet(141/298 Pages) HOLTEK

141 / 298 page

Rev. 1.90

140

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Rev. 1.90

141

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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

Single Pulse Mode

Toselectthismode,bitsTnM1andTnM0intheTMnC1registershouldbesetto10respectively

andalsotheTnIO1andTnIO0bitsshouldbesetto11respectively.TheSinglePulseOutputMode,

asthenamesuggests,willgenerateasingleshotpulseontheTMoutputpin.

ThetriggerforthepulseoutputleadingedgeisalowtohightransitionoftheTnONbit,whichcan

beimplementedusingtheapplicationprogram.HoweverintheSinglePulseMode,theTnONbit

canalsobemadetoautomaticallychangefromlowtohighusingtheexternalTCKnpin,whichwill

inturninitiatetheSinglePulseoutput.WhentheTnONbittransitionstoahighlevel,thecounter

willstartrunningandthepulseleadingedgewillbegenerated.TheTnONbitshouldremainhigh

whenthepulseisinitsactivestate.Thegeneratedpulsetrailingedgewillbegeneratedwhenthe

TnONbitisclearedtozero,whichcanbeimplementedusingtheapplicationprogramorwhena

comparematchoccursfromComparatorA.

HoweveracomparematchfromComparatorAwillalsoautomaticallycleartheTnONbitandthus

generatetheSinglePulseoutputtrailingedge.InthiswaytheCCRAvaluecanbeusedtocontrol

thepulsewidth.AcomparematchfromComparatorAwillalsogenerateaTMinterrupt.Thecounter

canonlyberesetbacktozerowhentheTnONbitchangesfromlowtohighwhenthecounter

restarts.IntheSinglePulseModeCCRPisnotused.TheTnCCLRandTnDPXbitsarenotusedin

thisMode.

Lead in g Ed ge

Tn ON b it

0 ® 1

S/ W Co mm and

SE T "T nO N"

TC Kn P in T r ans it io n

Tn ON b it

1 ® 0

S/ W Co mm and

CL R "T nO N"

CCR A Ma tc h C om par e

Pu ls e Wi dt h = CCRA V al ue

Tr ai li ng E dge

TM n Ou t put P in

Single Pulse Generation

HT66F20 Datasheet(PDF) 141 Page - Holtek Semiconductor Inc

HT66F20 Datasheet(HTML) 141 Page - Holtek Semiconductor Inc

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