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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List the major sections of the keyboard interface. The programs, which are used to convert any language into machine language, is referred to as tanslators.

It has more op-codes It has microckntroller op-codes so progrmming is little bit easy when compared to microprocessor. State the relation between the number of address pins and physical memory space. When terminal TC output pin is high one level outputit indicates that the terminal count register count is zero.


It has two output modes. The general-purpose registers are used as the source or destination register during data transfer and computation, as pointers to memory as counters. Procedure is otherwise inner program of a main program.


Give the advantages of microprocessor based system. Polling is a scheme or an algorithm to identify the devices interrupting the processor. The controller manages data transfer between memory and a peripheral under its control, by passing the microprocessor. The masking status of an interrupt can be obtained by executing RIM instruction.

What is the use of UART? The dedicated adder in Microontroller, is used to produce 20 bit address. This type of procedure is called as single procedure. The polling can be classified into software polling and hardware polling.

The computing system designed using a microprocessor as its CPU is called microcomputer. Manufacturer fixes these vector addresses. Arithmetic and Logic unit ALU. The terminals and computers that are sending or receiving the serial data are referred to as data terminal equipment or DTE.

An external device initiates the Hardware Interrupts, by placing an appropriate signal at the interrupt pin of microcontrolleg processor. The port-C pins are used for handshake signals. The RSC is a serial bus consisting of a maximum of 25 signals. What do you mean by volatile? The interrupts at IRQ input lines are handled by interrupt request register internally.

What are the functions performed by port-C of ? What is the purpose of assembler directive statements? It may be manipulated as a 16 bit data register or as two independent 8 bit registers.


Microprocessors and Micro controllers Two Marks with answers | Devasena A. –

SBUF Serial data buffer this register holds the data that has to be transmitted through the serial port and also holds the data that is received. Give any two advantages of assembly language over machine language. PIC is used for data transfer between the peripheral and the microprocessor.

Qs1 Qs2 Meaning 0 0 Nothing happens 0 1 Opcode first byte from queue 1 0 Queue is empty 1 1 Subsequent byte from queue. What are index registers? What are interrupt service routines? In relative addressing mode the operand is specified as an 8bit displacement with respect to PC.

An interrupt service routine has been developed in order to perform the operations required for a device that is interrupting the processor.