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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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HT67F370 bảng dữ liệu(PDF) 34 Page - Holtek Semiconductor Inc |
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HT67F370 bảng dữ liệu(HTML) 34 Page - Holtek Semiconductor Inc |
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34 / 225 page  Rev. 1.00 34 �an�a�� 0�� �01� Rev. 1.00 35 �an�a�� 0�� �01� HT67F370 TinyPowerTM A/D Flash MCU with LCD & EEPROM HT67F370 TinyPowerTM A/D Flash MCU with LCD & EEPROM Flash Memory Write Function Enable Procedure InordertoallowuserstochangetheFlashmemorydatathroughtheIAPcontrolregisters,users mustfirstenabletheFlashmemorywriteoperationbythefollowingprocedure: Step1.Write"110"intotheFMOD2~FMOD0bitstoselecttheFWENmode. Step2.SettheFWPENbitto"1".Thestep1andstep2canbeexecutedsimultaneously. Step3.Thepatterndatawithasequenceof00H,04H,0DH,09H,C3Hand40Hmustbewritten intotheFD1L,FD1H,FD2L,FD2H,FD3LandFD3Hregistersrespectively. Step4.Acounterwithatime-outperiodof300μswillbeactivatedtoallowuserswritingthecorrect patterndataintotheFD1L/FD1H~FD3L/FD3Hregisterpairs.Thecounterclockisderived fromLIRCoscillator. Step5.Ifthecounteroverflowsorthepatterndataisincorrect,theFlashmemorywriteoperation willnotbeenabledandusersmustagainrepeattheaboveprocedure.ThentheFWPENbit willautomaticallybeclearedto0byhardware. Step6.Ifthepatterndataiscorrectbeforethecounteroverflows,theFlashmemorywriteoperation willbeenabledandtheFWPENbitwillautomaticallybeclearedto0byhardware.The CFWENbitwillalsobesetto1byhardwaretoindicatethattheFlashmemorywrite operationissuccessfullyenabled. Step7.OncetheFlashmemorywriteoperationisenabled,theusercanchangetheFlashROMdata throughtheFlashcontrolregister. Step8.TodisabletheFlashmemorywriteoperation,theusercancleartheCFWENbitto0. Flash Memory Write Function Enable Procedure Set FMOD [2:0] =110 & FWPEN=1 → Select FWEN mode & Start Flash write Hardware activate a counter Wrtie the following pattern to Flash Data registers FD1L= 00h , FD1H = 04h FD2L= 0Dh , FD2H = 09h FD3L= C3h , FD3H = 40h Success END Yes Failed CFWEN=0 CFWEN = 1 No Is counter overflow ? No FWPEN=0 Is pattern correct ? Yes Flash Memory Write Function Enable Procedure |
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