15-02-2013, 10:27 AM
ADDRESSING MODES OF 8085
ADDRESSING MODES.ppt (Size: 688 KB / Downloads: 19)
INTRODUCTION
To perform any operation, we have to give the corresponding instructions to the microprocessor.
In each instruction, programmer has to specify 3 things:
Operation to be performed.
Address of source of data.
Address of destination of result.
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.
The term addressing mode refers to the way in which the operand of the instruction is specified.
Types of Addressing Modes
Intel 8085 uses the following addressing modes:
Direct Addressing Mode
Register Addressing Mode
Register Indirect Addressing Mode
Immediate Addressing Mode
Implicit Addressing Mode
Implicit Addressing Mode
If address of source of data as well as address of destination of result is fixed, then there is no need to give any operand along with the instruction.
CMA is the operation.
A is the source.
A is the destination.