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instruction register
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Possibe way of implementing ret instruction in 8085 if ret insruction was not present?
You would have to pop the stack into two dedicated memory locations in RAM, saving and restoring the register(s) used to do that, prefix those two locations with a JMP opcode, and JMP to the JMP.
What is the instruction for exit in 8085 microprocessors?
There is no exit instruction in the 8085. Do you mean return, as in from a function or interrupt? If so, the instruction is RET.
What register points to the next instruction?
actually register holds the data..there are 6 register which are temporary registers..program counter holds the address of next instruction to be fetched..instruction register holds the currently executed data...
What is the consists in the Instruction register?
The Instruction Register contains the current instruction being executed. It is an internal, special register, and you can not do anything explicit with it. If you are referring to the Program Counter, that simply contains the address of the next instruction to execute. It is incremented for each opcode and operand byte fetched.
What is CLK in Instruction register?
Clock
What is register addressing mode?
If 8 or 16 bit data is required for executing the instruction present in register/register pair and named of register/register pair is given along the register.this instruction is called register addressing mode instruction.for example:MOV B,A
What will happen when pop instruction is executed?
The top of stack to copied to the specified register and the stack pointer is incremented by 2. A special form of POP, RET, has the program continuing with the popped address in the program counter, i.e. a return from subroutine or function call.
What is the operational difference between the IRET and RET instruction?
Both are used for Return operations. But the difference is IRET uses extra 2 bytes along with 2 bytes(making it 4 bytes) for poping from stack. And RET uses only 2 byte of instruction for Poping. IRET is used to switch from Virtual Mode to Protected Mode whereas RET isn't.
What is the name of the cycle in which an instruction is taken from memory and loaded into the instruction register?
Fetch
What is the basic difference between instruction RET and IRET in 8086 microprocessor?
RET pops the PC off of the stack, while IRET pops both the flags and the PC off of the stack.
Instruction Buffer Register?
An Instruction Buffer Register is also known as IBR. It registers a computer's processor or its Central Processing Unit (CPU).
Can arithmetic be performed in the instruction register?
yes
