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HT45F39 Datasheet(PDF) 73 Page - Holtek Semiconductor Inc |
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HT45F39 Datasheet(HTML) 73 Page - Holtek Semiconductor Inc |
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73 / 102 page  Rev. 1.10 72 July 01, 2016 Rev. 1.10 73 July 01, 2016 HT45F39/HT45F391 Ultrasonic Distance Measurement 8-bit Flash MCU HT45F39/HT45F391 Ultrasonic Distance Measurement 8-bit Flash MCU FIFORD_ADDR BIT 7 6 5 4 3 2 1 0 NAME — — — FRD4 FRD3 FRD2 FRD1 FRD0 R/W — — — R R R R R POR — — — 0 0 0 0 0 ThecurrentreadaddressoftheFIFOdata.datathisaddressItisareadonlyregister. FIFOCTRL BIT 7 6 5 4 3 2 1 0 NAME — — — — Empty Full FRESET FSTART R/W — — — — R R R/W R/W POR — — — — 0 0 0 0 Bit7~4 Unimplemented Bit3 Empty 0:Notempty 1:Empty IftheFIFOreadaddressisequaltotheFIFOwriteaddressbyoneaddress,the flagisautomaticallysetto"1"untiltheuserwritesa"0"toclearisthebitusingthe applicationprogram.ThebitisonlyvalidifAEVMODissetto"1". Bit2 Full 0:Notfull 1:Full IftheFIFOwriteaddressisbehindtheFIFOreadaddressbyoneaddress,theflagis automaticallysetto"1"untiltheuserwritesa"0"toclearthebitusingtheapplication program.ThebitisonlyvalidifAEVMODissetto"0". Bit1 FRESET The FRESET bit is used to align the Read address andWrite address in the FIFO.Whenthealignmenthasbeenimplemented,thisbitwillbeclearedto"0" automatically.NotethatthisbitisonlyvalidiftheFSTARTbitissetto"0". Bit0 FSTART 1:StarttowritedataintoFIFOorreaddatafromtheFIFOautomaticallythroughthe Auto-Envelopeprocessingmechanismusinghardware. 0:StopwritingdataintotheFIFOorreadingdatafromtheFIFOthroughtheAuto- envelopeprocessingmechanism.DatacanbewrittentoorreadfromtheFIFO manuallyusingtheapplicationprogram. NotethatwhentheAEVMODbitissethigh,thedesignercanwritethedataintoFIFO astheComparatordata.WhentheAEVMODbitisclearedlow,thedesignercanread thedatafromFIFO. |
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