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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CS Microprocessors & MicroControllers lecture notes.

What is scanning in display and what is scan time? The maximum clock frequency for the is 8 MHz. Modems and other equipment used to send serial data over long distances are known as data communication equipment DCE. Double buffered means that one character can be loaded into a holding buffer while another character is being shifted out of the actual transmit microcohtroller register.

The function of this register is to store the address of the starting memory location, which will be accessed by the DMA channel. The address and data buffer are used to drive external address and data buses respectively. Then the device can start and stop according to the program. The interrupts at IRQ input lines are handled by interrupt request register internally.

What is the disadvantage in keyboard interfacing using ports? A RET instruction at the end of the procedure returns execution to the next instruction in the program. DMA is an input technique commonly used for high speed data transfer between systems memory and external device.


How to check whether an interrupt is masked or not?

The largest and most powerful computers are called mainframes. The major differences are as follows: Vectoring is the process of generating the address of interrupt service routine to be loaded in program counter.


User defined software interrupts are initiated through INTR pin. Setting DF to one causes string instruction to auto decrement and clearing DF causes string instructions auto increment.

Parallel data transfer Serial data transfer In this mode all bits of a word are transmitted at a In this mode only one bit of a word is transmitted at time. The decoded outputs repeat the pattern ,, and No clock wave form is transmitted with asynchronous data, since the start and stop bits are used for synchronization.

Each functional unit works independently most of the time.

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

If it goes both ways simultaneously. What is relative addressing mode? In fixed priority scheme, each device connected to a channel is assigned with a fixed priority. And bit binary number or code is called word. What is the function of mode set register? This mode is used in subroutine to address an array on a stack. Polling is a scheme or an algorithm to identify the devices interrupting the processor. List the logical operations possible using ? It is an output signal from the processor.


List the applications of microcomputer. What is a break character in A? Microprocessors and Microcontrollers Microprocessor 2. What is based indexed addressing mode?

BIOS is the acronym for basic input output system to be useful in reporting the system configuration when the system is turned on. Masking is preventing the interrupt from disturbing the program. Code segment register contains the base or start of the current code segment. If the Is programmed for decoded scan then the output of scan lines will be decoded output if it is programmed for encoded scan then the output of scan lines will be binary count.

What are the functions of DMA controllers?

The has six numbers of 8-bit FIFO registers, which is used for instruction queue. CF is set if there is a carry from addition or borrow from subtraction. Microprocessors and Microcontrollers XLAT — this instruction is useful for translating characters from one code to another code.

The programs, which are used to convert any language into machine language, is referred to as tanslators. A storage device, which needs refreshing once it is switched off by power, to retain the charges.