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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Usually the first 9-signals are sufficient for most of the serial data transmission. It has eight addressable 8 bit registers: Macro is assigned by a group of instruction in a short sequence and which is a type of subroutine.


What is meant by minimum mode? UART is used to perform asynchronous communication.

List the important features of What does masking mean? The maximum clock frequency for the is 8 MHz. What are the task involved in keyboard interface?

The microprocessor has to fetch read the data from memory or input device for processing and after processing, it has to store write the data to memory or output device. What are the operating modes microconrroller port —A of ?


Address bus is a unidirectional signal, and data bus is a bidirectional signal. The has six numbers of 8-bit FIFO registers, which is used for instruction queue. The ALU is the unit that performs the arithmetic mcrocontroller logical operations.

Processes which execute on different computer modules communicate by exchanging messages through a Message transfer system. This flag is used for BCD operation.

Anna University Chennai Cs – microprocessors and microcontrollers model question papers

What is the function of memory interfacing? It has more op-codes It has less op-codes so progrmming is little bit easy when compared to microprocessor. It is set to access data from external memory or else it is grounded for internal memory operation.

If this bit is 1 then the interrupt is pending. Its function is to hold a 16 bit address. What are the functions of QS1 and QS0 pins in ? What is the function of scan counter? The receiver checks the remainder to detect the error in the transmission. An interrupt service routine has been developed in order to perform the operations required for a device that is interrupting the processor. This mode is used in subroutine to address an array on a stack.


The bus interface unit provides the external bus operations for HL register pair also functions as data pointer or memory pointer. The largest and most powerful computers are called mainframes. Cleared to 0 by program to disable all interrupts; set to 1 to permit individual interrupts to be enable by their enable bits.

How vector addresses are generated for software interrupts of ? BX register is similar to HL register pair. The computing system designed using a mivrocontroller as its CPU is called microcomputer. Due to this the width of program counter decides the maximum program length in bytes. This cross over connection is often called a null ad.