Interested to Buy Any Domain ? << Click Here >> for more details...
Answer Posted / amita
The program counter, or PC (also called the instruction pointer[1], or instruction address register[2], or just part of the instruction sequencer[3] in some computers) is a processor register that indicates where the computer is in its instruction sequence. Depending on the details of the particular computer, the PC holds either the address of the instruction being executed, or the address of the next instruction to be executed.
In most processors, the instruction pointer is incremented automatically after fetching a program instruction, so that instructions are normally retrieved sequentially from memory, with certain instructions, such as branches, jumps and subroutine calls and returns, interrupting the sequence by placing a new value in the program counter.
Such jump instructions allow a new address to be chosen as the start of the next part of the flow of instructions from the memory. They allow new values to be loaded (written) into the program counter register. A subroutine call is achieved simply by reading the old contents of the program counter, before they are overwritten by a new value, and saving them somewhere in memory or in another register. A subroutine return is then achieved by writing the saved value back in to the program counter again.
| Is This Answer Correct ? | 29 Yes | 22 No |
Post New Answer View All Answers
What all does a microprocessor comprise of?
List various types of interrupts available in 8051 microcontroller?
List out addressing modes in mcs-51?
What is the difference between program memory and data memory?
Explain two ways of converting a two input nand gate to an inverter?
Explain what is the difference between isr & function call?
With the help of an example explain how physical address is calculated?
What type of interrupts are used for critical events and why?
In case of DVD, the speed is referred in terms of n X. Here what does X refers to
What is the the total addressable memory size in a 8085 microprocessor?
What is base segment address?
Differentiate between hardware and software interrupts and state examples for both?
How can interrupts be classified in the 8086?
Describe the accumulator register of 8085?
What is the function of reset out signal.
