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HT66F20 Datasheet(PDF) 116 Page - Holtek Semiconductor Inc |
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HT66F20 Datasheet(HTML) 116 Page - Holtek Semiconductor Inc |
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116 / 298 page  Rev. 1.90 116 �e���a�� 18� �01� Rev. 1.90 117 �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 TMnC1 Register Bit 7 6 5 4 3 2 1 0 Name TnM1 TnM0 TnIO1 TnIO0 TnOC TnPOL TnDPX TnCCLR 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 TnM1~TnM0:SelectTMnOperatingMode 00:CompareMatchOutputMode 01:Undefined 10:PWMMode 11:Timer/CounterMode ThesebitssetuptherequiredoperatingmodefortheTM.Toensurereliableoperation theTMshouldbeswitchedoffbeforeanychangesaremadetotheTnM1andTnM0 bits.IntheTimer/CounterMode,theTMoutputpincontrolmustbedisabled. Bit5~4 TnIO1~TnIO0:SelectTPn_0,TPn_1outputfunction CompareMatchOutputMode 00:Nochange 01:Outputlow 10:Outputhigh 11:Toggleoutput PWMMode 00:PWMoutputinactivestate 01:PWMoutputactivestate 10:PWMoutput 11:Undefined Timer/counterMode Unused ThesetwobitsareusedtodeterminehowtheTMoutputpinchangesstatewhena certainconditionisreached.Thefunctionthatthesebitsselectdependsuponinwhich modetheTMisrunning. IntheCompareMatchOutputMode,theTnIO1andTnIO0bitsdeterminehowthe TMoutputpinchangesstatewhenacomparematchoccursfromtheComparatorA. TheTMoutputpincanbesetuptoswitchhigh,switchlowortotoggleitspresent statewhenacomparematchoccursfromtheComparatorA.Whenthebitsareboth zero,thennochangewilltakeplaceontheoutput.TheinitialvalueoftheTMoutput pinshouldbesetupusingtheTnOCbitintheTMnC1register.Notethattheoutput levelrequestedbytheTnIO1andTnIO0bitsmustbedifferentfromtheinitialvalue setupusingtheTnOCbitotherwisenochangewilloccurontheTMoutputpinwhen acomparematchoccurs.AftertheTMoutputpinchangesstateitcanberesettoits initiallevelbychangingtheleveloftheTnONbitfromlowtohigh. InthePWMMode,theTnIO1andTnIO0bitsdeterminehowtheTMoutputpin changesstatewhenacertaincomparematchconditionoccurs.ThePWMoutput functionismodifiedbychangingthesetwobits.Itisnecessarytochangethevalues oftheTnIO1andTnIO0bitsonlyaftertheTMnhasbeenswitchedoff.Unpredictable PWMoutputswilloccuriftheTnIO1andTnIO0bitsarechangedwhentheTMis running. |
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