- 您现在的位置：买卖IC网 > PDF目录132984 > MC56F8247MLH (FREESCALE SEMICONDUCTOR INC) 16-BIT, FLASH, 60 MHz, MICROCONTROLLER, PQFP64 PDF资料下载
参数资料
| 型号： | MC56F8247MLH |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 16-BIT, FLASH, 60 MHz, MICROCONTROLLER, PQFP64 |
| 封装： | 10 X 10 MM, 1.40 MM HEIGHT, 0.50 MM PITCH, ROHS COMPLIANT, PLASTIC, MS-026BCD, LQFP-64 |
| 文件页数： | 43/88页 |
| 文件大小： | 4050K |
| 代理商： | MC56F8247MLH |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页当前第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页第74页第75页第76页第77页第78页第79页第80页第81页第82页第83页第84页第85页第86页第87页第88页
MC56F825x/MC56F824x Digital Signal Controller, Rev. 3
Specifications
Freescale Semiconductor
48
6.2.4
Flash Lockout Recovery without Mass Erase
6.2.4.1
Without Presenting Back Door Access Keys to the Flash Unit
A user can unsecure a secured device by programming the word 0x0000 into program flash location 0x00 7FF7. After
completing the programming, the JTAG TAP controller and the device must be reset to return to normal unsecured operation.
The user is responsible for directing the device to invoke the flash programming subroutine to reprogram the word 0x0000 into
program flash location 0x00 7FF7. You can do so, for example, by toggling a specific pin or downloading a user-defined key
through serial interfaces.
NOTE
Flash contents can be programmed only from ones to zeroes.
6.2.4.2
Presenting Back Door Access Key to the Flash Unit
The user can temporarily bypass security through a “back door” access scheme, using a four-word key to temporarily unlock
the flash. “Back door” access requires support from the embedded software. This software would typically permit an external
user to enter the four-word code through one of the communications interfaces and then use it to attempt the unlock sequence.
If the input matches the four-word code stored at location 0x00 7FFC–0x00 7FFF in the flash memory, the device immediately
becomes unsecured (at runtime) and internal memory is accessible via the JTAG/EOnCE port. Refer to the device’s reference
manual for details. The key must be entered in four consecutive accesses to the flash, so this routine should be designed to run
in RAM.
6.3
Product Analysis
To analyze a product’s failures in the field, the recommended method of unsecuring a secured device appears in Section 6.2.4.2,
“Presenting Back Door Access Key to the Flash Unit.” The customer must supply technical-support details about the protocol
to access the subroutines in flash memory. An alternative method for performing analysis on a secured device is to mass-erase
and reprogram the flash memory with the original code, but also to modify or not program the security word.
7
Specifications
7.1
General Characteristics
The MC56F825x/MC56F824x is fabricated in high-density, low-power, low-leakage CMOS process with 5 V–tolerant,
TTL-compatible digital inputs. The term 5 V–tolerant refers to the capability of an I/O pin, built on a 3.3 V–compatible process
technology, to withstand a voltage up to 5.5 V without damaging the device. Many systems have a mixture of devices designed
for 3.3 V and 5 V power supplies. In such systems, a bus may carry both 3.3 V–compatible and 5 V–compatible I/O voltage
levels (a standard 3.3 V I/O is designed to receive a maximum voltage of 3.3 V
± 10% during normal operation without causing
damage). This 5 V–tolerant capability therefore combines the power savings of 3.3 V I/O levels with the ability to receive 5 V
levels without damage.
CAUTION
This device contains protective circuitry to guard against damage due to high static voltage
or electrical fields. However, normal precautions are advised to avoid application of any
voltages higher than maximum-rated voltages to this high-impedance circuit. Reliability of
operation is enhanced if unused inputs are tied to an appropriate voltage level.
相关PDF资料 |
PDF描述 |
|---|---|
| MCF51QF32VLH | FLASH, 50 MHz, MICROCONTROLLER, PQFP64 |
| MB95F354EPF | 8-BIT, FLASH, MICROCONTROLLER, PDSO24 |
| MB95F354LPFT | 8-BIT, FLASH, MICROCONTROLLER, PDSO24 |
| MB95F354LPF | 8-BIT, FLASH, MICROCONTROLLER, PDSO24 |
| MB9AF311LPMC1 | 32-BIT, FLASH, 40 MHz, RISC MICROCONTROLLER, PQFP64 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MC56F8247VLH | 功能描述:数字信号处理器和控制器 - DSP, DSC DSC 64 LQFP 48K FL RoHS:否 制造商:Microchip Technology 核心:dsPIC 数据总线宽度:16 bit 程序存储器大小:16 KB 数据 RAM 大小:2 KB 最大时钟频率:40 MHz 可编程输入/输出端数量:35 定时器数量:3 设备每秒兆指令数:50 MIPs 工作电源电压:3.3 V 最大工作温度:+ 85 C 封装 / 箱体:TQFP-44 安装风格:SMD/SMT |
| MC56F8247VLHR | 制造商:Freescale Semiconductor 功能描述:MICRO CONTROLLER |
| MC56F824X | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:Digital Signal Controller Battery chargers and management |
| MC56F8255 | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:Digital Signal Controller Battery chargers and management |
| MC56F8255MLD | 功能描述:数字信号处理器和控制器 - DSP, DSC DSC 44 LQFP 64K FL RoHS:否 制造商:Microchip Technology 核心:dsPIC 数据总线宽度:16 bit 程序存储器大小:16 KB 数据 RAM 大小:2 KB 最大时钟频率:40 MHz 可编程输入/输出端数量:35 定时器数量:3 设备每秒兆指令数:50 MIPs 工作电源电压:3.3 V 最大工作温度:+ 85 C 封装 / 箱体:TQFP-44 安装风格:SMD/SMT |
发布紧急采购，3分钟左右您将得到回复。