AT89C51AC3-RDTIM datasheet(52/141 Pages) ATMEL

Part #	AT89C51AC3-RDTIM

Description	Enhanced 8-bit Microcontroller with 64KB Flash Memory

PDF	141 Pages

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Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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52 / 141 page

AT89C51AC3

4383A–8051–10/04

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

Protection Description

Security

level

LB0

LB1

LB2

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

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.

Writing And Reading EEPROM Data from external parallel programmer

is disabled but still allowed from internal code execution..

Same as 3, also external execution is disabled

AT89C51AC3-RDTIM Datasheet(PDF) 52 Page - ATMEL Corporation