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參數(shù)資料
| 型號(hào)： | 56F8014 |
| 廠商： | 飛思卡爾半導(dǎo)體(中國(guó))有限公司 |
| 英文描述： | 16-bit Digital Signal Controllers |
| 中文描述： | 16位數(shù)字信號(hào)控制器 |
| 文件頁(yè)數(shù)： | 83/124頁(yè) |
| 文件大?。?/td> | 1878K |
| 代理商： | 56F8014 |
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Flash Access Lock and Unlock Mechanisms
56F8014 Technical Data, Rev. 3
Freescale Semiconductor
Preliminary
83
To start the lockout recovery sequence, the JTAG public instruction (LOCKOUT_RECOVERY) must
first be shifted
into
the
chip-level
TAP controller’s
LOCKOUT_RECOVERY instruction has been shifted into the instruction register, the clock divider value
must be shifted into the corresponding 7-bit data register. After the data register has been updated, the user
must transition the TAP controller into the RUN-TEST/IDLE state for the lockout sequence to commence.
The controller must remain in this state until the erase sequence has completed. Refer to the
56F8000
Peripheral Reference Manual
for more details, or contact Freescale.
instruction
register. Once
the
Note:
Once the lockout recovery sequence has completed, the user must reset both the JTAG TAP controller
(by advancing the TAP state machine to the reset state) and the 56F8014 (by asserting external chip
reset) to return to normal unsecured operation.
7.2.3
CodeWarrior can unlock a device using the command sequence described in Section 7.2.2 by selecting the
Debug
menu, then selecting
DSP56800E
, followed by
Unlock Flash
.
Flash Lockout Recovery using CodeWarrior
Another mechanism is also built into CodeWarrior using the device’s memory configuration file. The
command “
Unlock_Flash_on_Connect1
” in the .
cfg
file accomplishes the same task as using the
Debug
menu.
7.2.4
The recommended method of unsecuring a programmed 56F8014 for product analysis of field failures is
via the backdoor key access. The customer would need to supply Technical Support
with the backdoor key
and the protocol to access the backdoor routine in the Flash. Additionally, the KEYEN bit that allows
backdoor key access must be set.
Product Analysis
An alternative method for performing analysis on a secured microcontroller would be to mass-erase and
reprogram the Flash with the original code, but modify the security bytes.
To insure that a customer does not inadvertently lock himself out of the 56F8014 during programming, it
is recommended that the user program the backdoor access key first, the application code second and the
security bytes within the FM configuration field last.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 56F8014_07 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:16-bit Digital Signal Controllers |
| 56F8014_08 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:16-bit Digital Signal Controllers |
| 56F801E | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:16-bit Digital Signal Controllers |
| 56F801XBLUG | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:16-bit Digital Signal Controllers |
| 56F802 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:16-bit Digital Signal Controllers |
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