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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Cleared to 0 by program to disable all interrupts; set to 1 to permit individual interrupts to be enable by their enable bits.


How can we initialize the A? Generally two types of modulation techniques are used. Explain the andd LOCK. Processes which execute on different computer modules communicate by exchanging messages through a Message transfer system. Give the function of control words of A The mode word informs about the baud rate, character length, parity and stop bits.

The basic blocks of a microprocessor are ALU, an array microcontoller registers and a control unit. There are upto interrupt vectors are availale in the interrupt vector table. What is Parity Flag? Stack top address is calculated using the contents of SS and SP registers. Defining a macro in another macro or calling a macro from inside a macro is called nested macro.



If more than one-channel requests services simultaneously the transfer is called as burst transfer. What is meant by maximum mode? In direct port mode, the port number is an 8 bit immediate operand. The bus cycle tells the basic operation of a processor to contact with the external device. Microprocessors and Microcontrollers The program called assembler is noes to convert the pnemonics of instructions along with the data into their equivalent object code modules.

A typical example is transmission from a microcomputer to a printer.

Generally minimum mode is opted for the smaller systems by means of single processor. HL register pair also functions as data pointer or memory pointer. What is the use of UART? What are the different types of polling?

What is the use of auxiliary carry flag in ? What is Increment Decrement Address Latch?

What is based indexed addressing mode? The internal devices of are port-A, port —B, port C.


The machine control flags are there. Address bus is a unidirectional signal, and data bus is a bidirectional signal. Modems and other equipment used to send serial data over long distances are known as data communication equipment DCE.

SF is set if MSB of the result is one. Give the types of DMA data transfer schemes? What are the names of general registers in ?

Timing and Control Circuitry. What is scanning in keyboard and what is scan time? It transfers eight bits of data simultaneously over eight data lines. Microprocessors and Microcontrollers Prepared by A. List the possibilities for S0, S1, S2 control signals in