HT45F77 datasheet(30/203 Pages) HOLTEK

30 / 203 page

Rev. 1.20

De�e��e� 1�� 201�

Rev. 1.20

De�e��e� 1�� 201�

HT45F77

Body Fat Scale Flash MCU

HT45F77

Body Fat Scale Flash MCU

Flash Memory Write Function Enable Procedure

InordertoallowuserstochangetheFlashmemorydatathroughtheIAPcontrolregisters,users

mustfirstenabletheFlashmemorywriteoperationbythefollowingprocedure:

• Write"110"intotheFMOD2~FMOD0bitstoselecttheFWENmode.

• SettheFWPENbitto"1".Thestep1andstep2canbeexecutedsimultaneously.

• Thepatterndatawithasequenceof00H,04H,0DH,09H,C3Hand40Hmustbewrittenintothe

FD1L,FD1H,FD2L,FD2H,FD3LandFD3Hregistersrespectively.

• Acounterwithatime-outperiodof300μswillbeactivatedtoallowuserswritingthecorrect

patterndataintotheFD1L/FD1H~FD3L/FD3Hregisterpairs.Thecounterclockisderivedfrom

LIRCoscillator.

• Ifthecounteroverflowsorthepatterndataisincorrect,theFlashmemorywriteoperationwill

notbeenabledandusersmustagainrepeattheaboveprocedure.ThentheFWPENbitwill

automaticallybeclearedto0byhardware.

• Ifthepatterndataiscorrectbeforethecounteroverflows,theFlashmemorywriteoperationwill

beenabledandtheFPWENbitwillautomaticallybeclearedto0byhardware.TheCFWENbit

willalsobesetto1byhardwaretoindicatethattheFlashmemorywriteoperationissuccessfully

enabled.

• OncetheFlashmemorywriteoperationisenabled,theusercanchangetheFlashROMdata

throughtheFlashcontrolregister.

• TodisabletheFlashmemorywriteoperation,theusercancleartheCFWENbitto0.

Flash Me�o�y

W�ite Fun�tion

Ena�le P�o�edu�e

Set FMOD [2:0] =110 & FWPEN=1

→ Sele�t FWEN �ode & Sta�t Flash w�ite

Ha�dwa�e a�tivate a �ounte�

W�tie the following patte�n to Flash Data �egiste�s

FD1L= 00h � FD1H = 0�h

FD2L= 0Dh � FD2H = 09h

FD3L= C3h � FD3H = �0h

Is patte�n is

�o��e�t ?

Is �ounte�

ove�flow ?

FWPEN=0 ?

yes

Su��ess

END

yes

Failed

FWPEN=0

CFWEN=0

CFWEN = 1

Flash Memory Write Function Enable Procedure

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