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HT45F65 Datasheet(PDF) 34 Page - Holtek Semiconductor Inc

Part # HT45F65
Description  Glucose Meter 8-Bit Flash MCU
PDF  231 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT45F65 Datasheet(HTML) 34 Page - Holtek Semiconductor Inc

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Rev. 1.60
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HT45F65/HT45F66/HT45F67
Glucose Meter 8-Bit Flash MCU
FD3L Register
Bit
7
6
5
4
3
2
1
0
�a�e
D7
D6
D�
D�
D3
D�
D1
D0
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
Bit7~0
D7~D0:ThefourthflashROMdata[7:0]
FD3H Register
Bit
7
6
5
4
3
2
1
0
�a�e
D1�
D1�
D13
D1�
D11
D10
D9
D8
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
Bit7~0
D15~D8:ThefourthflashROMdata[15:8]
Set Flash Write Enable (FWEN)
InordertoallowusertochangeFlashROMdatathroughFlashcontrolregister,theusermustfirst
enabletheFlashwriteoperationbythefollowingprocedure:
• Write110totheFMOD2~FMOD0forsettingFWENmode
• SetFWPENbitto1.Thestep1andstep2cansetsimultaneously
• TheHardwarewillstarta300μscountertoallowtheuserwritingthecorrectpatterndatato
FD1L/FD1H~FD3L/FD3H.(Theclockof300μscounterisfromLIRC.)
• Once300μscounterisoverfloworthepatternisuncorrect.TheenableFlashwriteoperationis
failandtheusermustrepeattheaboveprocedureonemore
• Nomatter,theoperationissuccessorfail.ThehardwarewillclearFWPENbitautomatically
• Thepatterndatais(00H04H0DH09HC3H40H)toFD1L/FD1H~FD3L/FD3H
• OncetheFlashwriteoperationisenable,theusercanchangetheFlashROMdatathroughthe
Flashcontrolregister
• FordisabletheFlashwriteoperation,theuseronlyclearCFWEN,itisnoneedtowritetheabove
procedure
Set Flash Write
enable
Set FMOD[2:0]=110 (FWEN mode)
Set FWPEN=1,
Hardware set a counter
Wrtie the following pattern to Flash Data register
FD1L= 00h , FD1H = 04h
FD2L=0dh , FD2H = 09h
FD3L=C3h , FD3H = 40h
Is pattern is
correct ?
Is counter
overflow ?
FWPEN=0 ?
yes
no
Set FWEN mode fail
FWPEN=0
no
yes
Set FWEN mode success.
yes
no
END
Set Flash Write Enable Procedure



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