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HT66F20 Datasheet(PDF) 131 Page - Holtek Semiconductor Inc |
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HT66F20 Datasheet(HTML) 131 Page - Holtek Semiconductor Inc |
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131 / 298 page  Rev. 1.90 1�0 �e���a�� 18� �01� Rev. 1.90 1�1 �e���a�� 18� �01� 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 • TM2C1 Register – 16-bit STM Bit 7 6 5 4 3 2 1 0 Name T�M1 T�M0 T�IO1 T�IO0 T�OC T�POL T�DPX T�CCLR 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 Bit7~6 T2M1~T2M0:SelectTM2OperatingMode 00:CompareMatchOutputMode 01:CaptureInputMode 10:PWMModeorSinglePulseOutputMode 11:Timer/CounterMode ThesebitssetuptherequiredoperatingmodefortheTM.Toensurereliableoperation theTMshouldbeswitchedoffbeforeanychangesaremadetotheT2M1andT2M0 bits.IntheTimer/CounterMode,theTMoutputpincontrolmustbedisabled. Bit5~4 T2IO1~T2IO0:SelectTP2_0,TP2_1outputfunction CompareMatchOutputMode 00:Nochange 01:Outputlow 10:Outputhigh 11:Toggleoutput PWMMode/SinglePulseOutputMode 00:PWMoutputinactivestate 01:PWMoutputactivestate 10:PWMoutput 11:Singlepulseoutput CaptureInputMode 00:InputcaptureatrisingedgeofTP2_0,TP2_1 01:InputcaptureatfallingedgeofTP2_0,TP2_1 10:Inputcaptureatfalling/risingedgeofTP2_0,TP2_1 11:Inputcapturedisabled Timer/counterMode: Unused ThesetwobitsareusedtodeterminehowtheTMoutputpinchangesstatewhena certainconditionisreached.Thefunctionthatthesebitsselectdependsuponinwhich modetheTMisrunning. IntheCompareMatchOutputMode,theT2IO1andT2IO0bitsdeterminehowthe TMoutputpinchangesstatewhenacomparematchoccursfromtheComparatorA. TheTMoutputpincanbesetuptoswitchhigh,switchlowortotoggleitspresent statewhenacomparematchoccursfromtheComparatorA.Whenthebitsareboth zero,thennochangewilltakeplaceontheoutput.TheinitialvalueoftheTMoutput pinshouldbesetupusingtheT2OCbitintheTM2C1register.Notethattheoutput levelrequestedbytheT2IO1andT2IO0bitsmustbedifferentfromtheinitialvalue setupusingtheT2OCbitotherwisenochangewilloccurontheTMoutputpinwhen acomparematchoccurs.AftertheTMoutputpinchangesstateitcanberesettoits initiallevelbychangingtheleveloftheT2ONbitfromlowtohigh. InthePWMMode,theT2IO1andT2IO0bitsdeterminehowtheTMoutputpin changesstatewhenacertaincomparematchconditionoccurs.ThePWMoutput functionismodifiedbychangingthesetwobits.Itisnecessarytochangethevalues oftheT2IO1andT2IO0bitsonlyaftertheTMhasbeenswitchedoff.Unpredictable PWMoutputswilloccuriftheT2IO1andT2IO0bitsarechangedwhentheTMis running. |
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