What is operand in microcontroller?

Operand means the data we are operating upon (in most cases source data). It can be a direct address of memory, it can be register names, it can be any numerical data etc.

What is opcode comment and operand field?

Operation Field defines the operation code or pseudo-op. Operand Field specifies either the address or the data. Comment Field allows the programmer to document the software. Sometimes not all four fields are present in an assembly language statement. A line may contain just a comment.

What is an opcode used for?

An opcode identifies which basic computer operation in the instruction set is to be performed. It is used when writing machine code. It tells the computer to do something. Each machine language instruction typically has both an opcode and operands.

How are opcodes generated?

The opcode is the instruction that is executed by the CPU and the operand is the data or memory location used to execute that instruction….Opcodes and operands.

Where are opcodes stored?

Paper tape, mag tape, floppy disk, and hard disk are some of the external storage medium that the opcodes are stored on. etc. They’re loaded into the computer’s memory. When they’re being used that’s where they’re stored.

What is mnemonic and source program?

An “assembler” is a similar, but much simpler, translating program which translates each “low-level” instruction into a single “machine-level” instruction; each “machine-level” action is represented by a single, simple “low-level” textual code, called a “mnemonic” code. …

What is opcode and operand give example?

Opcode is a part of the instruction that tells the processor what should be done. Operand is a part of the instruction that contains the data to be acted on, or the memory location of the data in a register. Answered by Owen H. • Computing tutor.

What are opcodes and addresses in instruction words?

The first word of each instruction is called the opcode word. It contains an operation code (opcode) and zero, one, or two effective-address (EA) fields. If an operand is a variable stored in memory, then an additional instruction word may be used in computing the address of the memory location.

What is the opcode in binary?

An opcode is a single instruction that can be executed by the CPU. In machine language it is a binary or hexadecimal value such as ‘B6’ loaded into the instruction register. In assembly language mnemonic form an opcode is a command such as MOV or ADD or JMP. The opcode is the MOV instruction.

How many opcodes are there in 8085?

246
Number of instructions in 8085 Microprocessor