‘Microprocessors Interview Questions’ --------7

‘Microprocessors Interview Questions’ - KyaPoocha.com

It allows the memory capacity to be 1MB even though the address associated with individual instructions are 16 bits wide. It allows the instruction,data, or stack... Read more »

List the functions of Bus Interface Unit in 8086.
Sends out addresses Fetches instructions from memory Reads data from ports and memory Writes data to port and memory Read more »

List the branch related addressing mode:
Intra segment Direct Intra segment Indirect Inter segment Direct Inter Segment Indirect Read more »

Define Relative based indexed addressing mode:
Relative Based Indexed Addressing Mode : Effective Address is calculated by the sum of 8- or 16 bit displacement and a based indexed address. E.A.= (BX or BP) +... Read more »

Define Direct Addressing mode
A 16 bit offset address of the data memory location is specified with reference to the DS segment starting address. For.E.g MOV [1020H],5020H instruction transfers... Read more »

Define Immediate Addressing.
An 8 bit or 16 bit immediate data follows the instruction. For e.g MOV AX,5020H instruction transfers a word 5020H to the AX register . Read more »

Define Register Relative Addressing Mode.
Register Relative Addressing Mode : The Effective Address is Calculated by the sum of 8- or 16 bit displacement and the contents of a base Register or an index... Read more »

Compare the 8 bit microprocessors 8080A and 8085.
8080A is the predecessor of 8085. 8085 has the instruction set of 8080A plus some additional ones. Program written for 8080A will be executed by 8085. 8085 and 8080A... Read more »

What are the limitations of 8085 MPU?
(i) The lower order address bus of the 8085 microprocessor is multiplexed (time shared) with the data bus. The buses need to be demultiplexed. (ii) Appropriate... Read more »

Write about RST pins in 8085?
In 8085 ,three RST pins are available, such as RST 7.5 ,RST 6.5 , RST 5.5 RST represents Restart Interrupts. These are vectored interrupts that transfer the program... Read more »

List the four operations commonly performed by MPU( Micro processing Unit)?
Memory Read : Reads data (or instructions) from memory. Memory Write: Writes Data (or instructions) into memory. I/O Read: Accepts data from input devices. I/O Write:... Read more »

What is compiler?
Compiler is a program that translates English like words of a high level language into the machine language of a computer. A compiler read a given program ,called... Read more »

What do you mean ‘ Data Width’?
Data Width is the width of the ALU. An 8 bit ALU can add / subtract/ multiply etc.. two 8 bit numbers . In many cases, the external data bus is the same width as... Read more »

List the limitations of 8 bit microprocessor:
Lower Execution Speed It can address less memory size Few instructions are available Read more »

Define Real Time Systems
Real Time Systems are those in which timeliness is as important as the correctness of the outputs, although this does not mean that they have to be “fast systems”. Read more »