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EMBEDDED FLASH MEMORY INTERFACE S3F80JB
15-18
HARD LOCK PROTECTION
User can set Hard Lock Protection by writing ‘0110B’ in FMCON7-4. This function prevents the changes of data in
a flash memory area. 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. 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.
The program procedure in user program mode
1. Set Flash Memory User Programming Enable Register (FMUSR) to “10100101B”.
2. Set Flash Memory Control Register (FMCON) to “01100001B”.
3. Set Flash Memory User Programming Enable Register (FMUSR) to “00000000B”.
PROGRAMMING TIP — Hard Lock Protection
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SB1
LD FMUSR,#0A5H ; User program mode enable
LD FMCON,#01100001B ; Select Hard Lock Mode and Start protection
LD FMUSR,#00H ; User program mode disable
SB0
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