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In a three-byte instruction, the second byte typically indicates additional information related to the operation specified by the first byte. This can include operand types, addressing modes, or specific registers being used. The exact meaning of the second byte can vary depending on the instruction set architecture (ISA) being utilized. Therefore, understanding the context of the ISA is crucial for interpreting the second byte correctly.
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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 fetch cycles a three byte instruction requires for its execution?
There are three fetch cycles in a three byte instruction. The first one is four clock cycles long, while the other two are three clock cycles long. Depending on what the instruction does, there will then be more read/write cycles.
How do the instruction of 8085 is classified based on their function and word length?
The 8085 instruction set is classified into the following three groups according to word size: 1. One-word or 1-byte instructions 2. Two-word or 2-byte instructions 3. Three-word or 3-byte instructions
What is the advantage of using sjmp over ljmp?
SJMP is short jump. In this 2-byte instruction the first byte is opcode and second byte is relative address of target location. This can save some byte of memory in many applications where memory space is in short supply where as LJMP (Long Jump) is 3-byte instruction in which 1st byte is opcode and 2nd and 3rd byte represent the 16- bit address of target location.
What will be the content of program counter of 8085 mpu has fetched machine code located at the memory location 205FH?
It depends on whether the machine code is one, two, or three bytes long, and on whether or not the instruction transferred control to another location. In the case of a non-jump single byte instruction, the PC will have a value of 2060H after the instruction is complete, and it will be 2061H or 2062H after a two or three byte instruction. In the case of a jump, call, or interrupt, the PC will depend on the instruction.
What is the size of the instruction queue?
32 byte
What is the size of the instruction queue in 8086?
In 8086 the instruction queue is 6 byte long. This is because even the longest 8086 instruction is 6 byte long. Thus it is possible to prefetch even the longest instruction in the instruction set.
Mention any one byte call instruction and the address to which it is points to?
RST 2 is one example of a one byte call instruction. It points to 0010H.
How large is the instruction queue of the 8088?
32 byte
What is 1 byte instruction in microprocessor?
1byte instruction = MOV A,B 2byte instruction = MVI A,01H 3byte instruction = STA 2030H
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.
How many bytes are there for jump instruction in 8085?
There are 74 instructions in the 8085 microprocessor.
