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HT66F20 Datasheet(PDF) 148 Page - Holtek Semiconductor Inc |
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HT66F20 Datasheet(HTML) 148 Page - Holtek Semiconductor Inc |
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148 / 298 page  Rev. 1.90 148 �e���a�� 18� �01� Rev. 1.90 149 �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 • TM1C1 Register – 10-bit ETM Bit 7 6 5 4 3 2 1 0 Name T1AM1 T1AM0 T1AIO1 T1AIO0 T1AOC T1APOL T1CDN T1CCLR R/W R/W R/W R/W R/W R/W R/W R R/W POR 0 0 0 0 0 0 0 0 Bit7~6 T1AM1~T1AM0:SelectTM1CCRAOperatingMode 00:CompareMatchOutputMode 01:CaptureInputMode 10:PWMModeorSinglePulseOutputMode 11:Timer/CounterMode ThesebitssetuptherequiredoperatingmodefortheTM.Toensurereliableoperation theTMshouldbeswitchedoffbeforeanychangesaremadetotheT1AM1and T1AM0bits.IntheTimer/CounterMode,theTMoutputpincontrolmustbedisabled. Bit5~4 T1AIO1~T1AIO0:SelectTP1Aoutputfunction CompareMatchOutputMode 00:Nochange 01:Outputlow 10:Outputhigh 11:Toggleoutput PWMMode/SinglePulseOutputMode 00:PWMoutputinactivestate 01:PWMoutputactivestate 10:PWMoutput 11:Singlepulseoutput CaptureInputMode 00:InputcaptureatrisingedgeofTP1A 01:InputcaptureatfallingedgeofTP1A 10:Inputcaptureatfalling/risingedgeofTP1A 11:Inputcapturedisabled Timer/counterMode Unused ThesetwobitsareusedtodeterminehowtheTMoutputpinchangesstatewhena certainconditionisreached.Thefunctionthatthesebitsselectdependsuponinwhich modetheTMisrunning. IntheCompareMatchOutputMode,theT1AIO1andT1AIO0bitsdeterminehow theTMoutputpinchangesstatewhenacomparematchoccursfromtheComparator A.TheTMoutputpincanbesetuptoswitchhigh,switchlowortotoggleitspresent statewhenacomparematchoccursfromtheComparatorA.Whenthebitsareboth zero,thennochangewilltakeplaceontheoutput.TheinitialvalueoftheTMoutput pinshouldbesetupusingtheT1AOCbitintheTM1C1register.Notethattheoutput levelrequestedbytheT1AIO1andT1AIO0bitsmustbedifferentfromtheinitial valuesetupusingtheT1AOCbitotherwisenochangewilloccurontheTMoutputpin whenacomparematchoccurs.AftertheTMoutputpinchangesstateitcanberesetto itsinitiallevelbychangingtheleveloftheT1ONbitfromlowtohigh. InthePWMMode,theT1AIO1andT1AIO0bitsdeterminehowtheTMoutputpin changesstatewhenacertaincomparematchconditionoccurs.ThePWMoutput functionismodifiedbychangingthesetwobits.Itisnecessarytochangethevaluesof theT1AIO1andT1AIO0bitsonlyaftertheTMhasbeenswitchedoff.Unpredictable PWMoutputswilloccuriftheT1AIO1andT1AIO0bitsarechangedwhentheTMis running. |
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