T89C51CC02 Atmel, T89C51CC02 Datasheet - Page 37

• Manufacturer Part Number: T89C51CC02
• Description: 8-Bit MCU
• Manufacturer: Atmel

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.
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.
Rev.A - May 17, 2001
Security
level
1
2
3
4
Program Lock Bits
LB0
U
U
U
P
LB1
U
U
U
P
LB2
U
U
U
P
No program lock features enabled. MOVC instruction executed from external program
MOVC instruction executed from external program memory are disabled from fetching
Same as 2, also verify through parallel programming interface is disabled.
Same as 3, also external execution is disabled.
Table 16. Program Lock bit
memory returns non encrypted data.
code bytes from internal memory.
Preliminary
Protection description
T89C51CC02
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