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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262
INTERFACING: EXTERNAL MEMORY
SUMMARY
Built around Harvard architecture, MCS-51 supports a
maximum of 64K of program memory and 64K of data
memory in addition to its internal data memory. The
capabilities of on-chip program and data memories may
be enhanced by interfacing external program and data
memory devices with the processor. To access external
program memory, the EA input of the processor must
be connected with system ground. In such a case, PSEN
from the processor would generate external program
memory read signal. For external data memory reading
and writing, both RD
and WR signals are provided by
the processor.
MCS-51 generates 16-bit ...
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