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參數(shù)資料
| 型號： | MC56F8347MPY60 |
| 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)： | 20/160頁 |
| 文件大?。?/td> | 2217K |
| 代理商： | MC56F8347MPY60 |
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116
56F8347 Technical Data
Preliminary
Part 7 Security Features
The 56F8347 offers security features intended to prevent unauthorized users from reading the
contents of the Flash Memory (FM) array. The 56F8347’s Flash security consists of several
hardware interlocks that block the means by which an unauthorized user could gain access to the
Flash array.
However, part of the security must lie with the user’s code. An extreme example would be user’s
code that dumps the contents of the internal program, as this code would defeat the purpose of
security. At the same time, the user may also wish to put a “backdoor” in his program. As an
example, the user downloads a security key through the SCI, allowing access to a programming
routine that updates parameters stored in another section of the Flash.
7.1 Operation with Security Enabled
Once the user has programmed the Flash with his application code, the 56F8347 can be secured by
programming the security bytes located in the FM configuration field, which occupies a portion of
the FM array. These non-volatile bytes will keep the part secured through reset and through
power-down of the device. Only two bytes within this field are used to enable or disable security.
Refer to the Flash Memory section in the 56F8300 Peripheral User Manual for the state of the
security bytes and the resulting state of security. When Flash security mode is enabled in
accordance with the method described in the Flash Memory module specification, the 56F8347
will disable external P-space accesses (disabling EXTBOOT = 1 mode), restrict memory and
disable the core EOnCE debug capabilities. Normal program execution is otherwise unaffected.
7.2 Flash Access Blocking Mechanisms
The 56F8347 has several operating functional and test modes. Effective Flash security must
address operating mode selection and anticipate modes in which the on-chip Flash can be
compromised and read without explicit user permission. Methods to block these are outlined in the
next subsections.
7.2.1Forced Operating Mode Selection
At boot time, the SIM determines in which functional modes the 56F8347 will operate. These are:
Internal Boot Mode
External Boot Mode
Secure Mode
When Flash security is enabled as described in the Flash Memory module specification, the
56F8347 will boot in internal boot mode, disable all access to external P-space, and start executing
code from the Boot Flash at address 0x02_0000.
This security affords protection only to applications in which the 56F8347 operates in internal
Flash security mode. Therefore, the security feature cannot be used unless all executing code
resides on-chip.
When security is enabled, any attempt to override the default internal operating mode by asserting
the EXTBOOT pin in conjunction with reset will be ignored.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC56F8347MPYE | 功能描述:數(shù)字信號處理器和控制器 - DSP, DSC 16 BIT HYBRID CONTROLLER RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時器數(shù)量:3 設(shè)備每秒兆指令數(shù):50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風(fēng)格:SMD/SMT |
| MC56F8347VPY | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:16-BIT HYBRID CONTROLLERS |
| MC56F8347VPY60 | 制造商:Freescale Semiconductor 功能描述: |
| MC56F8347VPYE | 功能描述:數(shù)字信號處理器和控制器 - DSP, DSC 16 BIT HYBRID CNTRLR RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時器數(shù)量:3 設(shè)備每秒兆指令數(shù):50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風(fēng)格:SMD/SMT |
| MC56F8347VVF | 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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