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DS1855 Datasheet(PDF) 5 Page - Dallas Semiconductor |
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DS1855 Datasheet(HTML) 5 Page - Dallas Semiconductor |
5 / 20 page DS1855 5 of 20 FBh – FCh Lock Bytes Writing to these two bytes allows the user to lock or unlock the memory described in byte FAh. LOCK: If memory location FBh is written to 56h and memory location FCh is written to 25h, the device will enter lock mode. Write protection will become active in the memory locations that are specified in FAh. UNLOCK: If memory location FBh is written to 67h and memory location FCh is written to 36h, the device will be unlocked. Once unlocked, the user can change the setting of memory location FAh to affect the EEPROM write-protection. The locking can be updated at any time as long as the upper page is unlocked. FD – FFh Reserved Reserved |
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