Fujitsu FR81S User Manual
CHAPTER 45: FLASH MEMORY
5. Operation
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER : FLASH MEMORY
FUJITSU SEMICONDUCTOR CONFIDENTIAL
49
5.9.3. Unlocking Flash Security
Unlocking flash security is shown below.
The chip erase command can be performed on all flash macros using the following procedure.
(1) Erase WorkFlash.
(2) Erase program flash which contains the flash security code.
Erase program flash last, as shown above. Otherwise, the erase command to program flash is ignored.
Furthermore, if a reset is input between erases, repeat from step (1).
Note:
In the user-mode (internal FLASH activation), the erase command can be issued to an arbitrary flash macro,
and data in the flash macro be deleted. The order of the chip erase to each flash macro is recommended to
be executed from the viewpoint of the data protection stored in the flash macro as shown in the
above-mentioned.
MB91520 Series
MN705-00010-1v0-E
1970