Flash Security - Fujitsu 8FX Hardware Manual

MB95630H Series
26.7

Flash Security

The Flash security controller function prevents contents of the Flash memory
from being read by external pins.
■ Flash Security
Writing protection code "0x01" to the Flash memory address (0xFFFC) restricts access to the
Flash memory, disabling any read/write access to the Flash memory from any external pin.
Once the protection of the Flash memory is enabled, the function cannot be unlocked until a
chip erase command operation is executed.
It is advisable to write the protection code at the end of Flash programming to avoid enabling
unnecessary protection during writing.
Once Flash security is enabled, a chip erase operation must be executed before data can be
written to the Flash memory again.
MN702-00009-2v0-E
CHAPTER 26 DUAL OPERATION FLASH MEMORY
FUJITSU SEMICONDUCTOR LIMITED
26.7 Flash Security
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