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There are three conditions that will cause the EU to enter a “wait” mode. Note that the EU has no connection to the system buses. Register IP is incremented by 1 to prepare for the next instruction fetch.

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Note that any bytes presently in the queue must be discarded sunnil are overwritten. By passing the data back to the BIU, data can also be stored in a memory location or written to an output device.

Programs written for the can be run on the without any changes. Depending on the execution time of mircoprocessor first instruction, the BIU may fill the queue with several new instructions before the EU is ready to draw its next instruction.

To see this, consider what happens when the or is first started.


In this case control microprocessor 8086 by sunil mathur to be transferred to a new nonsequential address. In the micropocessor, the BIU data bus path is 8 bits wide versus the ‘s bit data bus. After waiting for the memory access, the EU can resume executing instruction codes from the queue and the BIU can resume filling the queue. The EU must wait while the instruction at the jump address is fetched.

It accomplishes this task via the three-bus system architecture previously discussed. The BIU is programmed to fetch a new instruction whenever the queue has room for one with the or two with the additional microprocessor 8086 by sunil mathur.

It must recognize, decode, and execute program instructions fetched from the memory unit.


This is a first-in, first-out storage register sometimes likened to a “pipeline”. The EU receives program instruction codes and data from the BIU, executes these instructions, and store the results in the general registers.

One other condition can cause the BIU to mucroprocessor fetching. Microprocessor 8086 by sunil mathur first occurs when an instruction requires access to a memory location not in the queue.

Microprocessor /Architecture, Programming and interfacing: Sunil Mathur

The advantage of this pipelined architecture is that the EU can execute instructions almost continually instead of having to wait for the BIU to fetch a new instruction. The important point to note, however, is that because the EU is the same for each processor, the programming instructions are exactly the 80866 for each. Another difference is that the instruction queue is four bytes microprocessor 8086 by sunil mathur instead of six.


Government of the People: Architecture, Programming and Interfacing Writer: The queue, however, assumes that instructions will always be executed in sequence and thus will be holding the matbur instruction codes. Once inside the BIU, the instruction is passed to the queue.

It receives and outputs all its data thru the BIU. The only difference between an microprocessor and an microprocessor is the BIU.

Microprocessor 8086 : Architecture, Programming And Interfacing

The second condition occurs when the instruction to be executed is a “jump” instruction. The BIU must suspend fetching instructions and output the address of microproceswor memory location.

Assuming that the queue is initially empty, microprocessor 8086 by sunil mathur EU immediately draws this instruction from the queue and begins execution.