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參數(shù)資料
| 型號： | FTS64K |
| 廠商： | 飛思卡爾半導體(中國)有限公司 |
| 英文描述： | 50/MDR/RECP/VERT PRS FIT/M2.6/SCW/30 MIN |
| 中文描述： | 64K的快閃記憶體字節(jié) |
| 文件頁數(shù)： | 37/44頁 |
| 文件大?。?/td> | 401K |
| 代理商： | FTS64K |
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37
5.
If any of the four 16-bit words does not match the Flash content the MCU remains secured.
After the Backdoor Access Sequence has been correctly matched, the microcontroller will be unsecured.
The Flash security byte can be programmed to the unsecure state, if desired.
In the unsecured state the user has full control of the contents of the four word Backdoor Key by
programming it in bytes $FF00 - $FF07 of the Flash Protection/Options Field.
The security of the Flash module as defined in the Flash Security/Options byte ($FF0F) is not changed by
unsecuring the flash module using the back door access scheme. The Back Door Comparison Key stored
in words $FF00 - $FF07 is unaffected by the Back Door Access sequence. After the next reset sequence,
the security state of the Flash module is determined by the Flash Security/Options byte ($FF0F)}. The
back door access method of unsecuring the microcontroller has no effect on the program and erase
protections defined in the Flash Protection Register FPROT.
ItisnotpossibletounsecurethemicrocontrollerinSpecialSingleChipmodebytheBackdoorAccessKey
sequence via the Background Debug Mode.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
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