UNIT I THE MICROPROCESSOR. Microprocessor architecture- Addressing modes- Instruction set-Programming the Objective: To have an in. CS / CS42 / EC / CS / Micro Processors and Micro Controllers Complete Notes CSE,IT 4th Semester regulation EC Microprocessor and Microcontroller Lecture Notes All 5 Units – Free notes for Anna university 4TH sem Subject CS MICROPROCESSORS AND.

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What is meant by simplex transmission? Before it starts functioning, writing two or four command words into respective command word registers must initialize the A. It is used to drive external high Order address Bus AA8.

Direct and indirect are two types of port addressing mode. How vector addresses are generated for software interrupts of ? The most common use of interrupt is to relieve the CPU from the burden of polling.

List the applications of microcomputer. ISR keeps a track of the requests being served. Hence the processor has to wait for the key bounces to settle before reading the key code.

In its status register, it contains a Zero flag and carry flag. What is burst transfer? If two interrupts with the same priority occur at the same time, them they have the following ranking: Discus about register bank: Speed operation Can solve complex problems Can be acted as such processor 3.


Macro is assigned by a group of instruction in a short sequence and which is a type of subroutine.

For what purpose QS1, QS2 signals are used in ? Parity flag and 5. Interrupt is a signal send by an external device to the processor so as to request the processor to perform a particular task or work.


A stream of data can be represented as a polynomial that is divided by a constant polynomial and the remainder, unique to that set of bits, is generated. What is the function of overflow flag in ? This register is interconnected to two 8-bit shift registers.

What is implied addressing mode? A flag is a flip-flop, which indicates some condition produced by the execution of an instruction or controls certain operations of EU.

List the registers used in HL registers are also called scratch pad registers, Prepared by A.


The High and Low are normal logic levels and high impedance state is electrical open circuit condition. It serves as a base register in indirect jumps, lookup table instruction and external data transfer. The is executing an Microprocesssor for servicing an interrupt and another interrupt occurs.

What is the use of interrupt flag? In encoded mode, an external decoder should be used to decode the scan lines. And bit binary number or code is called word. Also, the bit is the fundamental storage unit of computer memory. What is meant by memory segmentation?


What is the difference between register and memory? When no data are being transmitted, a receiver stays high at logic 1. Remember me on this computer.

How to check whether an interrupt is masked or not? Any of the pointers and index register or BX may contain the offset of the location to be addressed. If more than one-channel requests services simultaneously the transfer is called as burst transfer. It can handle the interrupt request from various devices and allow one by one to the processor.

Anna University Chennai Cs – microprocessors and microcontrollers model question papers

The string instructions assume S1 to point to first byte or work of the source operand and D! It is often referred to as universal asynchronous receiver transmitter or UART. What is tri- state logic? Arithmetic and Logic unit ALU. It is a program controlled semiconductor device ICwhich fetches, decode and executes instructions. Machine control flag register. What is the use of instruction queue? In asynchronous transmission, sometimes referred to as start-stop transmission, start and stop bit intervals are transmitted with each byte of information microfontroller the purpose of synchronization.