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8051 Microcontroller (Internals, Instructions, Programming and Interfacing)
book

8051 Microcontroller (Internals, Instructions, Programming and Interfacing)

by Subrata Ghosal
May 2024
Intermediate to advanced content levelIntermediate to advanced
503 pages
17h 2m
English
Pearson India
Content preview from 8051 Microcontroller (Internals, Instructions, Programming and Interfacing)
246
INTERFACING: EXTERNAL MEMORY
from a decoder with unused address lines as its input. In the present example, address lines An+1 to A15 may
be used for generating the chip-select signal.
As illustrated in Fig. 17.4, the PSEN
signal from the processor may directly be used as the read input for pro-
gram memory.  e de-multiplexer ‘octal latch’ is used to generate the lower address signals, A0–A7, with the help of
ALE output from the processor. Data output lines from program memory are directly connected with AD0–AD7
pins of the processor.  e EA input is pulled up to ensure external program memory access after completion of ac-
cessing internal ...
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Publisher Resources

ISBN: 9781282655034Publisher Website