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8085 Interview Questions & Answers - Learning Mode

8085 Interview Questions & Answers - Learning Mode

The Intel 8085 is an 8-bit microprocessor manufactured by Intel in the mid-1970s. It was binary-compatible with the more-famous Intel 8080 but required less supporting hardware, thus allowing simpler and less expensive microcomputer systems to be built.

Try 8085 Interview Questions & Answers - Exam Mode

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8085 Interview Questions & Answers - Learning Mode
Try 8085 Interview Questions & Answers - Exam Mode
Question: Can an RC circuit be used as clock source for 8085?

Answer: Yes, it can be used, if an accurate clock frequency is not required. Also, the component cost is low compared to LC or Crystal. Source:
Question: What is machine cycle,instruction cycle and T-state?

Answer: Machine Cycle:The necessary steps to a fetch,a read or a write operation constitute a Machine cycle.

Instruction Cycle:The necessary steps that a CPU carries out to fetch an instruction and necessary data from the memory,and to execute it constitute an Instruction Cycle.

T-state:One sub-division of an operation performed in one clock cycle is called a T-state. Source:
Question: Difference between memory mapped IO and IO mapped IO?

Answer: Memory mapped IO is one where the processor and the IO device share the same memory location(memory) while IO mapped IO is one where the processor and the IO device have different memory located to each other. Source:
Question: What is clock frequency for 8085?

Answer: 3 MHz is the maximum clock frequency for 8085. Source:
Question: In 8085 name the 16 bit registers?

Answer: Stack pointer and Program counter all have 16 bits. Source:
Question: What is the difference between program counter and stack pointer?
What is the difference between data and address?
What are the difference between memory and memory location?

Answer: Program counter is a register which holds the address of next instruction when the current instruction is under execution while stack pointer is a pointer which points to the top element of the stack.Data is a value which we use in the execution of instruction. Data value can be manipulated. while a address is the some constant value to a particular memory location which the help of address of memory location we can access the data present in the memory.
Memory is a data storage device which Source:
Question: Which Stack is used in 8085?

Answer: LIFO (Last In First Out) stack is used in 8085.In this type of Stack the last stored information can be retrieved first. Source:
Question: What are the various flags used in 8085?

Answer: Sign flag, Zero flag, Auxillary flag, Parity flag, Carry flag. Source:
Question: How do address and data lines are demultiplexed in 8085?

Answer: During the first clock cycle of a memory access, the data lines contain the low order address. External hardware is expected to latch that address on the trailing edge of ALE, Address Latch Enable. During the next clock cycle, the data lines either float (for read, S1=1) or change to data value (for write, S1=0). Source:
Question: Why should Balance Sheet Tally, explain?

Answer: The liability part of the balance sheet is basically for investment purpose. suppose u take 50000 loan its a liability but it is used for purchasing some asset .... therefore u cant use more that u have.
asset + liabilities= capital Source:
Question: What is Stack Pointer?

Answer: Stack pointer is a special purpose 16-bit register in the Microprocessor, which holds the address of the top of the stack. Source:
Question: Which interrupt has the highest priority?

Answer: TRAP has the highest priority Source:
Question: How many interrupts are there in 8085?

Answer: There are 12 interrupts in 8085. Source:
Question: How can we read/write structures from/to data files?

Question: What are Hardware interrupts?

Answer: TRAP, RST7.5, RST6.5, RST5.5, INTR Source:
Question: What is Tri-state logic?

Answer: Three Logic Levels are used and they are High, Low, High impedance state. The high and low are normal logic levels & high impedance state is electrical open circuit conditions. Tri-state logic has a third line called enable line. Source:
Question: what are assembler and cross assembler?

Answer: A simple assembler means that we develope a programe in one platform and run it on the same platform compiler.
cross compiler defines that we develope a programe in one flatform run it on other flatform. for exmple:borland c and turbo c. Source:
Question: Explain briefly about 8085,8086 ?

Answer: 8085 is a 8 bit micro processor and all registers have a size of 8-bit.the address bus width is 16 lines so it can handle 64kbytes of memory.
8086 is 16 bit microprocessor.address width of 20 lines so it can handle 1Mbyte of memory. Source:
Question: What is Program counter?

Answer: Program counter holds the address of either the first byte of the next instruction to be fetched for execution or the address of the next byte of a multi byte instruction, which has not been completely fetched. In both the cases it gets incremented automatically one by one as the instruction bytes get fetched. Also Program register keeps the address of the next instruction. Source:
Question: Define interrupt?

Answer: External devices or internal abnormal conditions can interrupt the normal program execution of a microprocessor. Source:

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