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C8051F363 参数 Datasheet PDF下载

C8051F363图片预览
型号: C8051F363
PDF下载: 下载PDF文件 查看货源
内容描述: 混合信号ISP功能的Flash MCU系列 [Mixed Signal ISP Flash MCU Family]
分类和应用:
文件页数/大小: 288 页 / 2659 K
品牌: SILICON [ SILICON ]
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C8051F360/1/2/3/4/5/6/7/8/9  
13.2. Security Options  
The CIP-51 provides security options to protect the Flash memory from inadvertent modification by soft-  
ware as well as to prevent the viewing of proprietary program code and constants. The Program Store  
Write Enable (bit PSWE in register PSCTL) and the Program Store Erase Enable (bit PSEE in register  
PSCTL) bits protect the Flash memory from accidental modification by software. PSWE must be explicitly  
set to ‘1’ before software can modify the Flash memory; both PSWE and PSEE must be set to ‘1’ before  
software can erase Flash memory. Additional security features prevent proprietary program code and data  
constants from being read or altered across the C2 interface.  
A Security Lock Byte located at the last byte of Flash user space offers protection of the Flash program  
memory from access (reads, writes, or erases) by unprotected code or the C2 interface. The Flash security  
mechanism allows the user to lock n 1024-byte Flash pages, starting at page 0 (addresses 0x0000 to  
0x03FF), where n is the 1’s complement number represented by the Security Lock Byte. Note that the  
page containing the Flash Security Lock Byte is unlocked when no other Flash pages are locked  
(all bits of the Lock Byte are ‘1’) and locked when any other Flash pages are locked (any bit of the  
Lock Byte is ‘0’). See the example below for an C8051F360.  
Security Lock Byte:  
1’s Complement:  
11111101b  
00000010b  
Flash pages locked:  
3 (First two Flash pages + Lock Byte Page)  
0x0000 to 0x07FF (first two Flash pages) and  
0x7800 to 0x7BFF (Lock Byte Page)  
Addresses locked:  
‘F360/1/2/3/4/5/6/7  
'F368/9  
Reserved  
Reserved  
0x7C00  
0x4000  
0x7BFF  
0x7BFE  
0x3FFF  
0x3FFE  
Lock Byte  
Lock Byte  
Locked when any  
other Flash pages are  
locked  
0x7800  
0x3C00  
Flash memory organized  
in 1024-byte pages  
Unlocked Flash Pages  
Unlocked Flash Pages  
Access limit set  
according to the Flash  
security lock byte  
0x0000  
0x0000  
Figure 13.1. Flash Program Memory Map  
138  
Rev. 1.0