Types of Instructions in 8085

8085 microprocessor follows 3 types of instructions;

1              1. Load/Store Instructions

·         Load/Store operations are those which move the data between a register in the processor and a memory location (or another register).

·         They are often collectively referred to as data movement instructions.

·         Examples for load/store instructions are:

LDA(Load Accumulator directly from memory), STA(Store the content of Accumulator in the specified memory location) and so forth.

2               2. Arithmetic/Logic Instructions

·         Arithmetic instructions provide the primary data processing capabilities of the computer.

·         Example for arithmetic/logic instructions are:

ADD(Add to Accumulator), SUB(Subtract from accumulator), AND, OR, EOR, etc.

3               3. Test/Branch Instructions

·         They provide the decision-making capabilities.

·         The test must often be performed on the result of some prior arithmetic/logic operation.

·         It determines whether the result was zero or non-zero, positive/negative or some other binary choice involving bits in any operand with the instruction.

·         Example: CMA (complement the content of accumulator)