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The BIU is programmed to fetch a new instruction whenever the queue has room for one with the or two with the additional bytes.
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The EU receives program instruction codes and data from the BIU, executes these instructions, and micrlprocessor the results in the general registers. Register IP is incremented by 1 to prepare for the next instruction fetch. Programs written for the can be run on the without any changes. This is a first-in, first-out storage register sometimes likened to a “pipeline”.
Microprocessor /Architecture, Programming and interfacing: Sunil Mathur
The only difference between an microprocessor and an microprocessor is microprocessor 8086 by sunil mathur BIU. Depending on the execution time of the first instruction, the BIU may fill the microprocessor 8086 by sunil mathur with several new instructions before the EU is ready to draw its next instruction. Note that the EU has no connection to the system buses. It receives and outputs all its data thru the BIU. 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 second condition occurs when the instruction to be executed is a “jump” instruction.
In this case control is to be transferred to a new nonsequential address. There are three conditions that will cause the EU to enter a “wait” mode.
It must recognize, decode, and execute program instructions fetched from the memory unit. It accomplishes this task via the eunil system architecture previously discussed.
Architecture, Programming and Interfacing Writer: Government of the People: The important point to note, however, is that because the EU is the same for each processor, the programming instructions are exactly the same for each. Note that any bytes presently in the sunik must microprocessor 8086 by sunil mathur discarded they are overwritten.
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The first occurs when an instruction requires access to a memory location not in the queue. Another difference is that the instruction queue is four bytes long instead of six.
The queue, however, assumes that microprocessor 8086 by sunil mathur will always be executed in sequence and thus will be holding the “wrong” instruction codes.
By passing the data back to the BIU, data can also be stored in a memory location or written to an output device. Assuming that the queue is initially empty, the Hy immediately draws this instruction from the queue and begins execution.
Microprocessor : Architecture, Programming and Interfacing – Mathur Sunil – Google Books
One other condition can cause the BIU to suspend fetching. After waiting for the memory access, the EU can resume executing instruction codes from the queue and the BIU can resume sunill the queue.
Once inside the BIU, the instruction is passed to the queue. The BIU must suspend fetching instructions and output the address of this memory location.
The EU must wait while the instruction microprocesor the jump address is fetched. In thethe BIU data bus path is 8 bits wide versus the ‘s bit data bus. To see this, consider what happens when the or is first started.