Micro Controller Interview Questions - Part 3
Write a program to swap two numbers using 8051 ?MOV A,# data
Write a program to subtract two numbers & exchange the digits using 8051 ?MOV A,#9F MOV R0,#40
What are the different types of Address decoding Techniques ?
Comparison between full address decoding and Partial address decoding ?Full address decoding
What is the significance of wait state generator ?This is used to transfer data between slower I/O device and the microprocessor. In some applns, the speed of I/O systems is not compatible with the microprocessor’s timings. So the microprocessor has to confirm whether the peripheral is ready or not. If READY pin is high, the peripheral is ready otherwise 8085 enters in to wait state.
What is a Non-maskable interrupt ?It is unaffected by any mask or interrupt enable. Eg: TRAP
What is a Data pointer register ?The data pointer register (DPTR) consists of a high byte(DPH) and a low byte (DPL) functions to hold 16 bit address. It may be manipulated as a 16-bit data register or as independent 8-bit registers. It serves as a base register in indirect jumps, look up table instructions and external data transfer.
What are the operating modes of 8279 ?1. Input modes
What are the different functional units in 8279 ?
What are the priority modes in 8259 ?
Micro Controller Interview Questions - Part 4 >>>