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HT45F3W Datasheet(PDF) 82 Page - Holtek Semiconductor Inc |
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HT45F3W Datasheet(HTML) 82 Page - Holtek Semiconductor Inc |
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82 / 167 page  Rev. 1.50 8� De�e��e� 01� �01� Rev. 1.50 83 De�e��e� 01� �01� HT45F3W R-Type Blood Pressure Meter Flash MCU HT45F3W R-Type Blood Pressure Meter Flash MCU TMnC1 Register (n=0 or 1) Bit 7 6 5 4 3 2 1 0 Na�e 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.AftertheTMoutputpinchangesstate,itcanberesettoits initiallevelbychangingtheleveloftheTnONbitfromlowtohigh. InthePWMMode,theTnIO1andTnIO0bitsdeterminehowtheTMoutputpin changesstatewhenacertaincomparematchconditionoccurs.ThePWMoutput functionismodifiedbychangingthesetwobits.Itisnecessarytoonlychangethe valuesoftheTnIO1andTnIO0bitsonlyaftertheTMnhasbeenswitchedoff. UnpredictablePWMoutputswilloccuriftheTnIO1andTnIO0bitsarechangedwhen theTMisrunning. |
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