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Program Memory Lock Bits
The AT89S52 has three lock bits that can be left unprogrammed
(U) or can be programmed (P) to obtain the additional
features listed in the following table.
Program Lock Bits
LB1 LB2 LB3 Protection Type
1 U U U No program lock features
2 P U U MOVC instructions executed
from external program
memory are disabled from
fetching code bytes from
internal memory, EA is
sampled and latched on reset,
and further programming of
the Flash memory is disabled
3 P P U Same as mode 2, but verify is
also disabled
4 P P P Same as mode 3, but external
execution is also disabled
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