Instruction Set

An instruction set covers a number of aspects such as instructions, addressing modes, interrupts, exceptions, registers, etc. This instruction set plays a major role in the programming of a system. And this programming decides the working behaviour of various I/O ports. Talking about the instructions, they are of following types.

• Data handling and memory operation instructions:

1. Move data – This is used to move data to memory from registers and vice versa.
2. Read/write data – This is used to read/write data on memory, registers and I/O ports.
3. Set – A fix value on registers.

• Arithmetic and logical instructions:

1. Add, subtract, multiply and divide.
2. AND, OR, EXOR, NOT and SHIFT operations.
3. Compare operation.

• Control flow operation:

1. Branch operation
2. Conditionally branch operation
3. Indirectly branch operation

We can basically divide instruction set into following two versions: