What are the different ways to clear the accumulator?
SUB A is another one-byte instruction. It subtracts accumulator value from the accumulator. The XRA A and SUB A both are one-byte instruction, but as XRA A is logical, it performs faster than the other. So XRA A is best for clearing/resetting Accumulator content than other three instructions.
Which instruction stands for clear accumulator?
In 8085 Instruction set, STA is a mnemonic that stands for STore Accumulator contents in memory.
Which of the following instruction will clear the content of accumulator?
04․ Which one of the following instruction may be used to clear the accumulator content irrespective of its initial value? There is no such instruction like CLRA and MOV A, 00H. There is no guarantee that ORA A will result in zero but we can be sure SUB A will reset or clear the content of accumulator.
Which instruction can be used to selectively clear the bits of accumulator?
5) of Accumulator = 1. So the RST7. 5flip-flop receives logic 1 to its clear input and thus gets cleared when bit 4 of Accumulator = 1 and SIM instruction is executed. Alternatively, RST7.
How do you clear an accumulator in 8086?
Explanation – Register AX is used. MOV AX, 0000: copies 0000 to AX. AND AX, 0000: operation performs bit by bit ANDs the source operand (0000) to the destination operand and store the result in AX. XOR AX, AX: performs the XOR operation in values of source register and destination register and store the result in AX.
What is the importance of interrupts?
Interrupts are important because they give the user better control over the computer. Without interrupts, a user may have to wait for a given application to have a higher priority over the CPU to be ran. This ensures that the CPU will deal with the process immediately.
Why is memory hierarchy important in computer?
In computer architecture, the memory hierarchy separates computer storage into a hierarchy based on response time. Memory hierarchy affects performance in computer architectural design, algorithm predictions, and lower level programming constructs involving locality of reference.
What is the primary mechanism that enables sharing of the processor?
Shared memory is a technology that enables computer programs to simultaneously share memory resources for higher performance and fewer redundant data copies. Shared system memory can run on single processor systems, parallel multiprocessors, or clustered microprocessors.
Which of the following appropriately describes the purpose of the cache memory used by processors?
a) Cache memory is used to compensate the difference in capacity between real storage and virtual storage. In the other method, data is written only to a block in cache, and the modified block is written back into main memory only when it is replaced.
What kind of data is stored in cache memory?
Cache memory is an extremely fast memory type that acts as a buffer between RAM and the CPU. It holds frequently requested data and instructions so that they are immediately available to the CPU when needed. Cache memory is used to reduce the average time to access data from the Main memory.
What is difference between RAM and cache memory?
Cache is a smaller and fast memory component in the computer which is inserted between the CPU and the main memory….Difference between RAM and Cache :
| S.No. | RAM | CACHE |
|---|---|---|
| 7. | CPU reads Cache Memory data before reading RAM. | CPU reads RAM data after reading Cache Memory. |
Does cache affect RAM?
Cache memory holds frequently used instructions/data which the processor may require next and it is faster access memory than RAM, since it is on the same chip as the processor. This reduces the need for frequent slower memory retrievals from main memory, which may otherwise keep the CPU waiting.
Which is faster RAM or ROM?
ROM memory is used to store permanent information, which is non-erasable. The access speed of RAM is faster. Its speed is slower in comparison with RAM. Therefore, ROM can’t boost up the processor speed.