Samsung C8278X ユーザーズマニュアル

User can set Hard Lock Protection by write ‘0110’ in FMCON.7

−4. If this function is enabled, the user cannot write 

or erase the data in a flash memory area. This protection can be released by the chip erase execution (in the tool 
program mode).   

In terms of user program mode, the procedure of setting Hard Lock Protection is following that. Whereas in tool 
mode the manufacturer of serial tool writer could support Hardware Protection. Please refer to the manual of serial 
program writer tool provided by the manufacturer.   

1.  Set Flash Memory User Programming Enable Register (FMUSR) to “10100101B”. 

2.  Check user’s ID code (written by user) 

3.    Set Flash Memory Control Register (FMCON) to “01100001B”. 

4.    Set Flash Memory User Programming Enable Register (FMUSR) to “00000000B”.

 

⎯ Hard Lock Protection 

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SB1 
LD   

FMUSR,#0A5H 

  ; User Program mode enable 

CP   

UserID_Code,#User_value  ; Check user’s ID code (written by user) 

 

 

 

 

 

  ; User_value is any value by user 

JR   

NE,Not_ID_Code 

  ; If not equal, jump to Not_ID_Code 

LD   

FMCON,#01100001B 

  ; Hard Lock mode set & start   

NOP 

 

 

 

  ; Dummy Instruction, This instruction must be needed 

LD   

FMUSR,#0 

 

  ; User Program mode disable 

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Not_ID_Code: 

SB1 
LD   

FMUSR,#0 

 

  ; User Program mode disable 

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