參數(shù)資料
型號: MC56F8347VPY60
廠商: MOTOROLA INC
元件分類: 數(shù)字信號處理
英文描述: 16-BIT, 120 MHz, OTHER DSP, PQFP160
封裝: LQFP-160
文件頁數(shù): 23/160頁
文件大小: 2217K
代理商: MC56F8347VPY60
Flash Access Blocking Mechanisms
568347 Technical Data
119
Preliminary
Note:
Once the lockout recovery sequence has completed, the user must reset both the JTAG TAP
controller (by asserting TRST) and the 56F8347 (by asserting external chip reset) to return to
normal unsecured operation.
7.2.4
Product Analysis
The recommended method of unsecuring a programmed 56F8347 for product analysis of field
failures is via the backdoor key access. The customer would need to supply Motorola 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.
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 56F8347 during
programming, it is recommended that he program the backdoor access key first, his application
code second, and the security bytes within the FM configuration field last.
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