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MC9S12P64CFT 参数 Datasheet PDF下载

MC9S12P64CFT图片预览
型号: MC9S12P64CFT
PDF下载: 下载PDF文件 查看货源
内容描述: 微控制器 [Microcontrollers]
分类和应用: 微控制器外围集成电路时钟
文件页数/大小: 566 页 / 7414 K
品牌: FREESCALE [ Freescale ]
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128 KByte Flash Module (S12FTMRC128K1V1)  
7. Send BDM commands to execute the Program P-Flash command write sequence to program the  
Flash security byte to the unsecured state  
8. Reset the MCU  
13.5.3 Mode and Security Effects on Flash Command Availability  
The availability of Flash module commands depends on the MCU operating mode and security state as  
shown in Table 13-27.  
13.6 Initialization  
On each system reset the Flash module executes a reset sequence which establishes initial values for the  
Flash Block Configuration Parameters, the FPROT and DFPROT protection registers, and the FOPT and  
FSEC registers. The Flash module reverts to using built-in default values that leave the module in a fully  
protected and secured state if errors are encountered during execution of the reset sequence. If a double bit  
fault is detected during the reset sequence, both MGSTAT bits in the FSTAT register will be set.  
CCIF remains clear throughout the reset sequence. The Flash module holds off all CPU access for the  
initial portion of the reset sequence. While Flash memory reads and access to most Flash registers are  
possible when the hold is removed, writes to the FCCOBIX, FCCOBHI, and FCCOBLO registers are  
ignored. Completion of the reset sequence is marked by setting CCIF high which enables writes to the  
FCCOBIX, FCCOBHI, and FCCOBLO registers to launch any available Flash command.  
If a reset occurs while any Flash command is in progress, that command will be immediately aborted. The  
state of the word being programmed or the sector/block being erased is not guaranteed.  
S12P-Family Reference Manual, Rev. 1.13  
472  
Freescale Semiconductor  
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