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| 型号： | DEMO56F8014-E |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 107/124页 |
| 文件大小： | 0K |
| 描述： | BOARD DEMO MC56F8014 W/UNIV PS |
| 标准包装： | 1 |
| 类型： | MCU |
| 适用于相关产品： | 56F8014 |
| 所含物品： | 板，线缆，CD，电源 |
| 配用： | APMOTOR56F8000E-ND - KIT DEMO MOTOR CTRL SYSTEM |
| 相关产品： | MC56F8014VFAE-ND - IC DIGITAL SIGNAL CTRLR 32-LQFP |
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Flash Access Lock and Unlock Mechanisms
56F8014 Technical Data, Rev. 11
Freescale Semiconductor
83
memory chapter in MC56F8000RM, the 56F8000 Peripheral Reference Manual for details. When flash
security mode is enabled, the 56F8014 will disable the core EOnCE debug capabilities. Normal program
execution is otherwise unaffected.
7.2 Flash Access Lock and Unlock Mechanisms
There are several methods that effectively lock or unlock the on-chip flash.
7.2.1
Disabling EOnCE Access
On-chip flash can be read by issuing commands across the EOnCE port, which is the debug interface for
the 56800E CPU. The TCK, TMS, TDO, and TDI pins comprise a JTAG interface onto which the EOnCE
port functionality is mapped. When the device boots, the chip-level JTAG TAP (Test Access Port) is active
and provides the chip’s boundary scan capability and access to the ID register, but proper implementation
of flash security will block any attempt to access the internal flash memory via the EOnCE port when
security is enabled.
7.2.2
Flash Lockout Recovery Using JTAG
If the device is secured, one lockout recovery mechanism is the complete erasure of the internal flash
contents, including the configuration field, thus disabling security (the protection register is cleared). This
does not compromise security, as the entire contents of the user’s secured code stored in flash are erased
before security is disabled on the device on the next reset or power-up sequence.
To
start
the
lockout
recovery
sequence
via
JTAG,
the
JTAG
public
instruction
(LOCKOUT_RECOVERY) must first be shifted into the chip-level TAP controller’s instruction register.
Once the 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 MC56F8000RM, the 56F8000 Peripheral Reference Manual, for more details, or contact
Freescale.
Note:
Once the lockout recovery sequence has completed, the user must reset both the JTAG TAP controller
and the device to return to normal unsecured operation. Power-on reset will also reset both.
7.2.3
Flash Lockout Recovery Using CodeWarrior
CodeWarrior can unlock a device by selecting the Debug menu, then selecting DSP56800E, followed by
Unlock Flash. 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.
This lockout recovery mechanism also includes the complete erasure of the internal flash contents,
including the configuration field, thus disabling security (the protection register is cleared).
7.2.4
Flash Lockout Recovery Without Mass Erase
The user can un-secure a secured device by programming the word $0000 into program memory location
$00 1FF7. After completing the programming, both the JTAG TAP controller and the device must be reset
相关PDF资料 |
PDF描述 |
|---|---|
| DEMO56F8014 | BOARD DEMO MC56F8014 W/US PS |
| VE-BTR-EY-F2 | CONVERTER MOD DC/DC 7.5V 50W |
| VE-BTR-EY-F1 | CONVERTER MOD DC/DC 7.5V 50W |
| VE-BTR-EX-S | CONVERTER MOD DC/DC 7.5V 75W |
| VE-BTR-EW-S | CONVERTER MOD DC/DC 7.5V 100W |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DEMO56F8014-EE | 功能描述:开发板和工具包 - 其他处理器 MC56F8014 BD W/UNIV PS RoHS:否 制造商:Freescale Semiconductor 产品:Development Systems 工具用于评估:P3041 核心:e500mc 接口类型:I2C, SPI, USB 工作电源电压: |
| DEMO90121DA | 功能描述:KIT DEMO RFID DOOR ACCESS RoHS:是 类别:RF/IF 和 RFID >> 过时/停产零件编号 系列:- 标准包装:1 系列:- 类型:用于 200/300 系列的欧盟开发套件 适用于相关产品:Zensys RF 模块 所含物品:开发板，模块，编程器，软件，线缆，电源 其它名称:703-1019Q3225667 |
| DEMO90121LR | 功能描述:KIT DEMO LONG RANGE READER RoHS:是 类别:RF/IF 和 RFID >> RFID 评估和开发套件及电路板 系列:- 产品培训模块:M24LR64 Dual Interface EEPROM 标准包装:1 系列:- 类型:读取器模块 频率:13.56MHz 适用于相关产品:M24LR-64-R 已供物品:2 根基准天线，I2C 和 RFID 读取器，样品 其它名称:497-10480 |
| DEMO908AP64 | 功能描述:开发板和工具包 - S08 / S12 MC68HC908AP64 DEMO BRD RoHS:否 产品:Development Kits 工具用于评估:MC9S12G128 核心:S12 接口类型:CAN, LIN, RS-232, USB 工作电源电压:5 V 制造商:Freescale Semiconductor |
| DEMO908AP64E | 功能描述:开发板和工具包 - S08 / S12 MC68HC908AP64 Demo Board RoHS:否 产品:Development Kits 工具用于评估:MC9S12G128 核心:S12 接口类型:CAN, LIN, RS-232, USB 工作电源电压:5 V 制造商:Freescale Semiconductor |
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