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1byte instruction = MOV A,B
2byte instruction = MVI A,01H
3byte instruction = STA 2030H
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What is 3 byte instruction in microprocessor?
A two-byte instruction gives the specific function instruction in two bytes, or two words. The first specifies the opcode, which tells the microprocessor what operation will occur. The second specifies the operand, or the data that the operation is done on.
How many bytes are there for jump instruction in 8085?
There are 74 instructions in the 8085 microprocessor.
How does a microprocessor know whether the next byte is an instruction or data?
A microprocessor know whether the next byte is an instruction or data because the microprocessor knows for what it is looking. The bus, on the other hand, for an 8085 based system, knows an opcode from data by looking at S0 and S1 when IO/M- is low. If both are high, it is an opcode, otherwise it is data.
How does the microprocessor work?
Suppose we give a 8-bit instruction ADD B to the microprocessor then this instruction is not at all understood by microprocessor as it only accepts binary inputs so first of all it stores the instruction in the INSTRUCTION REGISTOR then it decodes this instruction ADD B to its suitable binary code 80H in the INSTRUCTION DECODER.. after converting to 80H then the microprocessor understands that .. yes i have to add the content of the resistor B with that of A(accumulator) and store the result in the accumulator A this is a small example how microprocessor operates facing the instructions
Different beetwen sim and rim?
SIM stands for “Set Interrupt Mask” It is 1 byte instruction RIM stands for “Read Interrupt Mask” it is 1 byte MULTI-PURPOSE instruction.
Justify RST instruction can be called 1 byte Call instruction?
The RST instruction is a 1 byte opcode with a 3 bit imbedded operand. There are 8 different RST instructions. Each pushes the PC on the stack, and loads the PC with the operand's value times 8. (0H, 8H, 10H, 18H, etc.)Pushing the PC on the stack and loading a new value into the PC is exactly what a CALL instruction does, so the RST instruction is a 1 byte CALL instruction. The difference between RST and CALL is that CALL is a 3 byte instruction which can go anywhere in memory in one instruction.
What is Inherent Addressing Mode?
1 byte instruction, no operand field
Types of instruction format of 8085?
The 8085 instruction set is classified into three groups according to its Word size. They are 1. One word /1 byte instructions 2. Two word / 2 byte instructions 3. Three word / 3 byte instructions
Various string instruction in 8086 microprocessor?
A series of data bytes or words available in a memory at consecutive locations, to be referred to collectively or individually, are called as byte strings or word strings.
What happens after the microprocessor completes an instruction?
It fetches the next instruction.
Which group of instruction do not affected the flag in microprocessor?
branch instruction
When the microprocessor completes an instruction what happens?
it goes to queue for next instruction
