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HT45F39 Datasheet(PDF) 31 Page - Holtek Semiconductor Inc |
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HT45F39 Datasheet(HTML) 31 Page - Holtek Semiconductor Inc |
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31 / 102 page  Rev. 1.10 30 July 01, 2016 Rev. 1.10 31 July 01, 2016 HT45F39/HT45F391 Ultrasonic Distance Measurement 8-bit Flash MCU HT45F39/HT45F391 Ultrasonic Distance Measurement 8-bit Flash MCU • PDFisclearedbyasystempower-uporexecutingthe"CLRWDT"instruction.PDFissetby executingthe"HALT"instruction. • TOisclearedbyasystempower-uporexecutingthe"CLRWDT"or"HALT"instruction.TOis setbyaWDTtime-out. Inaddition,onenteringaninterruptsequenceorexecutingasubroutinecall,thestatusregisterwill notbepushedontothestackautomatically.Ifthecontentsofthestatusregistersareimportantand iftheinterruptroutinecanchangethestatusregister,precautionsmustbetakentocorrectlysaveit. Notethatbits0~3oftheSTATUSregisterarebothreadableandwriteablebits. STATUS Register Bit 7 6 5 4 3 2 1 0 Name — — TO PDF OV Z AC C R/W — — R R R/W R/W R/W R/W POR — — 0 0 x x x x "x": unknown Bit7,6: unimplemented,readas"0" Bit5 TO:WatchdogTime-Outflag 0:Afterpoweruporexecutingthe"CLRWDT"orHALTinstruction 1:Awatchdogtime-outoccurred Bit4 PDF:Powerdownflag 0:Afterpoweruporexecutingthe"CLRWDT"instruction 1:Byexecuting"HALT"instruction Bit3 OV:Overflowflag 0:Nooverflow 1:Anoperationresultsinacarryintothehighest-orderbitbutnotacarryoutofthe highest-orderbitorviceversa. Bit2 Z:Zeroflag 0:Theresultofanarithmeticorlogicaloperationisnotzero 1:Theresultofanarithmeticorlogicaloperationisnotzero Bit1 AC:Auxiliaryflag 0:Noauxiliarycarry 1:Anoperationresultsinacarryoutofthelownibblesinaddition,ornoborrow fromthehighnibbleintothelownibbleonsubtraction Bit0 C:Carryflag 0:Nocarry-out 1:Anoperationresultsinacarryduringanadditionoperationorifaborrowdoes nottakeplaceduringasubtractionoperation Cisalsoaffectedbyarotatethroughcarryinstruction. |
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