May 2024
Intermediate to advanced
534 pages
17h 58m
English
book
8051 Microcontroller, Internals, Instructions, Programming and Interfacing, 2nd Edition
by Subrata Ghoshal
Content preview from 8051 Microcontroller, Internals, Instructions, Programming and Interfacing, 2nd Edition
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260
INTERFACING: EXTERNAL MEMORY
is sampled just before the read strobe is deactivated (goes high). A detailed example of interfacing external
program and data memory with MCS-51 would now be taken up after brief discussions about the security
features off ered in various MCS-51 devices.
17.5 | Software Security Features
To ensure some protection against unauthorized program memory access from external source, MCS-51 off ers a
program memory locking mechanism. Table 17.1 presents the locking features for various MCS-51 devices.
Device no. No. of lock bits present
8751H One
8751BH, 8752BH, 89C2051 Two
87C51, 89C51, 89C52 Three
Table 17.1 MCS-51 program ...
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