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HT67F488 Datasheet(PDF) 69 Page - Holtek Semiconductor Inc |
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HT67F488 Datasheet(HTML) 69 Page - Holtek Semiconductor Inc |
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69 / 171 page  Rev. 1.60 69 �ove��e� ��� �016 HT67F488/HT67F489 TinyPowerTM A/D Flash MCU with LCD & EEPROM TMnC1 Register Bit 7 6 5 4 3 2 1 0 �a�e TnM1 TnM0 TnIO1 TnIO0 TnOC TnPOL TnCAPTS 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:SelectTMnOperationMode 00:CompareMatchOutputMode 01:CaptureInputMode 10:PWMOutputModeorSinglePulseOutputMode 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 PWMOutputMode/SinglePulseOutputMode 00:PWMOutputinactivestate 01:PWMOutputactivestate 10:PWMoutput 11:Singlepulseoutput CaptureInputMode 00:InputcaptureatrisingedgeofTPn_0,TPn_1,TCKn 01:InputcaptureatfallingedgeofTPn_0,TPn_1,TCKn 10:Inputcaptureatfalling/risingedgeofTPn_0,TPn_1,TCKn 11:Inputcapturedisabled Timer/counterMode Unused ThesetwobitsareusedtodeterminehowtheTMoutputpinchangesstatewhena certainconditionisreached.Thefunctionthatthesebitsselectdependsuponinwhich modetheTMisrunning. IntheCompareMatchOutputMode,theTnIO1andTnIO0bitsdeterminehowthe TMoutputpinchangesstatewhenacomparematchoccursfromtheComparatorA. TheTMoutputpincanbesetuptoswitchhigh,switchlowortotoggleitspresentstate whenacomparematchoccursfromtheComparatorA.Whenthesebitsarebothzero, thennochangewilltakeplaceontheoutput.TheinitialvalueoftheTMoutputpin shouldbesetupusingtheTnOCbit.NotethattheoutputlevelrequestedbytheTnIO1 andTnIO0bitsmustbedifferentfromtheinitialvaluesetupusingtheTnOCbit otherwisenochangewilloccurontheTMoutputpinwhenacomparematchoccurs. AftertheTMoutputpinchangesstate,itcanberesettoitsinitiallevelbychanging theleveloftheTnONbitfromlowtohigh. InthePWMOutputMode,theTnIO1andTnIO0bitsdeterminehowtheTMoutput pinchangesstatewhenacertaincomparematchconditionoccurs.ThePWMoutput functionismodifiedbychangingthesetwobits.Itisnecessarytochangethevalues oftheTnIO1andTnIO0bitsonlyaftertheTMhasbeenswitchedoff.Unpredictable PWMoutputswilloccuriftheTnIO1andTnIO0bitsarechangedwhentheTMis running. |
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