What are the operand types in the instruction system?

The operand types in the instruction system include: 1. Address, the address can be considered as an unsigned integer; 2. Numbers, common numbers include fixed-point numbers, floating-point numbers and decimal numbers; 3. Characters, Since computers cannot process and transmit information in simple character form, ASCII codes are commonly used; 4. Logical data, that is, logical operations.

The operating environment of this tutorial: Windows 10 system, DELL G3 computer.

What are the types of operands in the instruction system?

Types of operands

Common operand types in machines include addresses, numbers, characters, logical data, etc.

1. Address

The address can actually be regarded as a kind of data. In many cases, the address of the operand needs to be calculated. At this time, the address can be considered as an unsigned integer.

2. Numbers

Common numbers in computers include fixed-point numbers, floating-point numbers and decimal numbers.

3. Characters

When using computers, text or strings are also a common data type. Since computers cannot process and transmit information in simple character formats, ASCII codes are commonly used.

4. Logical data

In addition to arithmetic operations, computers sometimes need to perform logical operations. In this case, n combinations of 0s and 1s are not considered arithmetic. numbers, but are treated as logical numbers.

Expand Knowledge: Command System

## The instruction system is the language system of computer hardware, also called machine language. It refers to the collection of all instructions possessed by the machine. It is the main interface between software and hardware and reflects the basic functions of the computer. From a system architecture perspective, it is the primary attribute of the computer as seen by the system programmer. Therefore, the instruction system represents the basic functions of the computer, determines the capabilities required by the machine, and also determines the format of the instructions and the structure of the machine.

Designing the instruction system is to choose whether some basic operations in the computer system (including operating systems and high-level languages) should be implemented by hardware or software, and whether certain complex operations should be implemented by a dedicated instruction , is still implemented by a series of basic instructions, and then specifically determines the instruction format, type, operation and access method of the operands of the instruction system.

The instruction system refers to the collection of all instructions that the computer can execute. It describes all the control information and "logical judgment" capabilities in the computer. The instruction systems of different computers contain different types and numbers of instructions. Generally include arithmetic operation type, logical operation type, data transfer type, judgment and control type, shift operation type, bit (bit string) operation type, input and output type and other instructions. The instruction system is an important factor that characterizes the performance of a computer. Its format and functions not only directly affect the hardware structure of the machine, but also directly affect the system software and the scope of application of the machine.

An instruction is a statement in machine language. It is a set of meaningful binary codes. The basic format of the instruction is as follows: opcode field and address code field, where the opcode specifies the operation nature and function of the instruction. The address code gives the operand or the address of the operand.

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