Question

Memory interfacing in 8085 microprocessor

Answer 1

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Memory Interfacing:- As we know that any
system which process digital data needs
the facility for storing the data. Interfacing is
a technique to be used for connecting the
Microprocessor to Memory.
Now a days Semiconductor memories are
used for storing purpose. There are some of
the advantages of the
semiconductor memory.
Small size
High speed
Better reliability
Low cost
Generally, RAM or ROM is used for memory
interfacing.
Memory:- A memory is a digital IC which
stores the data in binary form.
Memory Size:- The number of location and
number of bits per word will vary from
memory to memory. For example, If a
particular memory chip is capable of storing
M words with each word having N-bits. Then
the size of the memory will be M× N.
Interfacing a ROM memory of 4096*8 with
8085 Microprocessor:-
Given memory size = 4096 * 8
4096 =2^12.
So 12 lines will be used for interfacing. A0 to
A11
In this system A0 to A11 lines of
Microprocessor will be connected to
the address lines of the memory. and D0 to
D7 of the 8085 microprocessor will be
connected to the data bus of the memory.
As we know that the it is EPROM, so only RD
pin is connected to the microprocessor. There
is not the facility for writing data.