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ADDRESSING MODES
OF 8085
Mr
...
com
Gursharan Singh Tatla
1
Addressing Modes of 8085
To perform any operation, we have to
give the corresponding instructions to
the microprocessor
...
◦ Address of source of data
...
Gursharan Singh Tatla
2
Addressing Modes of 8085
The method by which the address of
source of data or the address of
destination of result is given in the
instruction is called Addressing
Modes
...
Gursharan Singh Tatla
3
Types of Addressing Modes
Intel 8085 uses the following
addressing modes:
1
...
Register Addressing Mode
3
...
Immediate Addressing Mode
5
...
LDA 2500 H Load the contents of memory
location 2500 H in accumulator
...
2500 H is the address of source
...
Gursharan Singh Tatla
5
Register Addressing Mode
In this mode, the operand is in general
purpose register
...
MOV is the operation
...
A is the destination
...
MOV A, M Move data from memory location
specified by H-L pair to accumulator
...
M is the memory location specified by
H-L register pair
...
Gursharan Singh Tatla
7
Immediate Addressing Mode
In this mode, the operand is specified
within the instruction itself
...
MVI is the operation
...
A is the destination
...
CMA
Complement accumulator
...
A is the source
...
Gursharan Singh Tatla
9
Gursharan Singh Tatla
10