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AT89C51ED2-RDTIM 数据表(PDF) 99 Page - ATMEL Corporation

部件名 AT89C51ED2-RDTIM
功能描述  8-bit Flash Microcontroller
PDF  137 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  ATMEL [ATMEL Corporation]
网页  http://www.atmel.com
标志 ATMEL - ATMEL Corporation

AT89C51ED2-RDTIM 数据表(HTML) 99 Page - ATMEL Corporation

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99
AT89C51RD2/ED2
4235E–8051–04/04
Table 71. Program Lock Bits of the SSB
Note:
U: Unprogrammed or "one" level.
P: Programmed or "zero" level.
X: Do not care
WARNING: Security level 2 and 3 should only be programmed after Flash and code
verification.
Flash Memory Status
AT89C51RD2/ED2 parts are delivered in standard with the ISP ROM bootloader.
After ISP or parallel programming, the possible contents of the Flash memory are sum-
marized in Figure 40:
Figure 40. Flash Memory Possible Contents
Memory Organization
When the EA pin is high, the processor fetches instructions from internal program Flash.
If the EA pin is tied low, all program memory fetches are from external memory.
Program Lock Bits
Protection Description
Security
Level
LB0
LB1
1
U
U
No program lock features enabled.
2
P
U
ISP programming of the Flash is disabled.
3
X
P
Same as 2, also verify through ISP programming interface is disabled.
0000h
Virgin
Default
After ISP
After Parallel
Programming
After Parallel
Programming
After Parallel
Programming
Application
Application
Virgin
After ISP
or
Dedicated
ISP
Dedicated
ISP
Application
Virgin
or
Application
Virgin
or
Application
FFFFh



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