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T89C51AC2-RLSI-M 数据表(PDF) 43 Page - ATMEL Corporation

部件名 T89C51AC2-RLSI-M
功能描述  8-bit MCU with 32K bytes Flash, 10 bits A/D and EEPROM
PDF  117 Pages
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制造商  ATMEL [ATMEL Corporation]
网页  http://www.atmel.com
标志 ATMEL - ATMEL Corporation

T89C51AC2-RLSI-M 数据表(HTML) 43 Page - ATMEL Corporation

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Draft.A - March 30, 2001
43
Preview - Confidential
T89C51AC2
10.2.1. Flash Parallel Programming
The three lock bits in Hardware byte are programmed according to Table, will provide different level of protection
for the on-chip code and data located in FM0 and FM1.
The only way for write this bits are the parallel mode.
Table 17. Program Lock bit
Program Lock bits
U: unprogrammed
P: programmed
WARNING: Security level 2 and 3 should only be programmed after Flash and Core verification.
Program Lock bits
These security bits protect the code access through the parallel programming interface. They are set by default to
level 4.
Program Lock Bits
Protection description
Security
level
LB0
LB1
LB2
1
UUU
No program lock features enabled. MOVC instruction executed from external program
memory returns non encrypted data.
2P
U
U
MOVC instruction executed from external program memory are disabled from fetching
code bytes from internal memory, EA is sampled and latched on reset, and further
parallel programming of the Flash is disabled.
3
U
P
U
Same as 2, also verify through parallel programming interface is disabled.
4
U
U
P
Same as 3, also external execution is disabled.



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