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Briefly describe three different addressing methods and the sources of their operands.

Addressing mode: immediate addressing, register addressing, direct addressing. operand sources: immediate, register operand, memory operand.

Immediate addressing method: Operants are directly included in instructions and are called immediate numbers. This addressing method is fast because data does not need to be read from memory, and it is suitable for situations where data changes infrequently in instructions. Register addressing method: Operants are stored in registers, which is extremely fast because the registers are internal to the CPU.

Immediate addressing: The operands provided by the immediate addressing method follow the opcode and are placed in the instruction code segment together with the opcode. The immediate number can be an 8-bit unsigned integer or a 16-bit unsigned integer, but cannot be a decimal number.

[Answer]: This question C examines the basic knowledge of the instruction system in a computer system. The addressing method in an instruction is how to interpret the address field in an instruction to obtain operands or to obtain a program branch address. Common addressing methods are: Immediate addressing: operands are included in the instructions. Direct addressing: The operands are stored in the memory unit, and the address of the memory unit where the operands are located is directly given in the instruction.

Source: Immediate addressing (2) Source: Base address indexing (3) Source: Base address (4) Source: Register indirect addressing (5) Source: Register addressing There are three types of operands in a computer: immediate numbers (constants), register operands, and memory operands, so the addressing method is based on these three types of operands.

Examples of seven addressing methods

1. Register addressing method: For 16-bit operands, the registers can be: AX, BX, CX, DX, SI, DI, SP, BP, etc.

2. In 51 MCU programming, there are seven common addressing methods. They are: Immediate addressing: Operants are directly embedded in instructions, such as `MOV A,#40H`. This addressing method is fast and simple, and is usually used to transmit constants or small immediate numbers. Direct addressing: The address of the operand appears directly in the instruction, such as `MOV A, 3AH`. This method is often used to access fixed addresses in data storage.

3. There are seven addressing methods in the instruction system of the MCS-51 microcontroller. They are: Immediate addressing Immediate addressing means that the operand is immediately followed by the opcode and placed it in the instruction code section together with the opcode. When the program is running, the program directly calls the operand without having to go to other address units to retrieve the corresponding operand. The above-mentioned operand written in the instruction is also called the immediate number.

Try to list the names of common addressing methods and their contents?

[1]This process of sequential execution of programs is called sequential addressing of instructions. To do this, the program counter (also known as the instruction pointer register) PC must be used to count the sequence number of the instruction, which is the instruction's address in memory. Skip addressing method When a program changes the order of execution, instructions are addressed in a skip addressing method.

The addressing method of instructions (1) The concept of effective address (2) Data addressing and instruction addressing (3) Basic concepts of common addressing methods CISC and RISC (5) The functions and basic structure of the central processing unit (CPU) The function and basic structure of the instruction execution process data path are based on the data path, the flow of instruction cycles and the data flow of fetch, address, execution and interrupt cycles.

Cache memory: The basic structure and working principle of Cache, the address mapping method of Cache, and the replacement strategy of Cache. (3) Secondary storage: The structure, access characteristics and performance parameter calculation of disk storage. Instruction system (1) Instruction format: The general format of machine instructions and the functions and characteristics of each field in the instruction word. (2) Addressing method: Effective address calculation method, addressing range, function and characteristics of common addressing methods.

If the operand is in memory, the addressing method can be

1. If the operand is in memory, the addressing methods can be: direct addressing, indirect addressing, register indirect addressing, base addressing, indexed addressing, and relative addressing. Direct addressing: Direct addressing means that the effective address (EA) of the operand in memory is directly given in the instruction, that is, the memory address of the operand is directly given by the instruction. This approach is simple and intuitive, but less flexible because each operation requires the address to be explicitly specified in the instruction.

2.[Answer]: C immediately addressing: The operand is in the instruction. Direct addressing: The operand address is in the instruction. Memory indirect addressing: operand addresses are in memory. Register addressing: The operand is in the register.

3. Register addressing: When the operands are not placed in memory, but in the CPU's general registers, register addressing can be used. Indirect register addressing: The difference from register addressing is that the register content in the instruction format is not the operand, but the address of the operand, which specifies that the operand is in memory.

4. operand source: immediate, register operand, memory operand.

5. The addressing method is how to interpret the address field in the instruction to obtain the operand method or the program transfer address method. Immediate addressing means that the operand is included in the instruction. Direct addressing means that the operands are stored in the memory unit, and the address of the memory unit where the operands are located is directly given in the instruction. Register addressing means that the operands are stored in a register, and the name of the register where the operands are stored is given in the instruction.

Complete Collection of Instructions--Hurry up and collect

Addressing method Immediate addressing: The value of the operand is given directly in the instruction. Direct addressing: The memory address of the operand is given directly in the instruction. Register addressing: Operands are stored in registers. Register indirect addressing: The operand is stored in the memory address pointed to by the register. Relative addressing: The address of the operand is the current instruction address plus an offset. Index addressing: The address of the operand is determined by a base register and an index register.

Cognitive (understanding) language instructions can correctly point out objects belonging to a certain category without assistance.

RoHS: EU Directive on the Restriction of Hazardous Substances in Electrical and Electronic Products to ensure product environmental compliance. EN71: EU Toy Safety Standard to ensure the safety of children's toys. EMC Directive: Electromagnetic compatibility certification, applicable to electronic equipment to ensure normal operation of the equipment in an electromagnetic environment. GS certification: Although German safety certification is voluntary, the requirements are higher than CE, which helps improve product competitiveness.

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