AT89C51CC03C-RLTIM 查看數據表（PDF） - Atmel Corporation

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AT89C51CC03C-RLTIM

Enhanced 8-bit MCU with CAN Controller and Flash Memory

Atmel Corporation 

AT89C51CC03

Table 17. Program Lock Bit

Program Lock Bits

Security

level

LB0

LB1

LB2 Protection Description

1

U

U

U No program lock features enabled.

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

2

P

U

U disabled.

ISP and software programming with API are still allowed.

Writing EEprom Data from external parallel programmer is disabled but

still allowed from internal code execution.

Same as 2, also verify through parallel programming interface is

disabled.

3

U

P

U

Writing And Reading EEPROM Data from external parallel programmer

is disabled but still allowed from internal code execution..

4

U

U

P Same as 3, also external execution is disabled

Program Lock bits

U: unprogrammed

P: programmed

WARNING: Security level 2 and 3 should only be programmed after Flash and Core

verification.

55

4182K–CAN–05/06

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