Sage-Tips

What is the function of a decoder?

A decoder is a device that generates the original signal as output from the coded input signal and converts n lines of input into 2n lines of output. An AND gate can be used as the basic decoding element because it produces a high output only when all inputs are high.

What is the function of decoder in microprocessor?

The instruction decoder of a processor is a combinatorial circuit sometimes in the form of a read-only memory, sometimes in the form of an ordinary combinatorial circuit. Its purpose is to translate an instruction code into the address in the micro memory where the micro code for the instruction starts.

What are the functions of the various components in 8085 microprocessor?

The architecture of the 8085 microprocessor mainly includes the timing & control unit, Arithmetic and logic unit, decoder, instruction register, interrupt control, a register array, serial input/output control. The most important part of the microprocessor is the central processing unit.

What is decoder in COA?

A Decoder can be described as a combinational circuit that converts binary information from the ‘n’ coded inputs to a maximum of 2^n different outputs.

What is decoder in microcontroller?

Microcontroller Operation To execute an instruction, the processor copies the instruction code from the program memory into the instruction register (IR). It can then be decoded (interpreted) by the instruction decoder, which is a combinational logic block which sets up the processor control lines as required.

What is the function of instruction register and decoder?

3 Instruction Register and Decoder. To execute an instruction, the processor copies the instruction code from the program memory into the instruction register (IR). It can then be decoded (interpreted) by the instruction decoder, which is a combinational logic block which sets up the processor control lines as required …

What is the role of decoder in communication?

In basic terms, humans communicate through a process of encoding and decoding. The encoder is the person who develops and sends the message. The audience then ‘decodes’, or interprets, the message for themselves. Decoding is the process of turning communication into thoughts.

What is decoder Javatpoint?

Advertisements. Decoder is a combinational circuit that has ‘n’ input lines and maximum of 2n output lines. One of these outputs will be active High based on the combination of inputs present, when the decoder is enabled. That means decoder detects a particular code.

What are flags in 8085?

8085 has five flags. Sign flag, zero flag, Auxiliary carry flag, Parity flag and Carry flag.

What is instruction decoder in 8085 microprocessor?

It is an 8-bit register. When an instruction is fetched from memory then it is stored in the Instruction register. Instruction decoder decodes the information present in the Instruction register. 8085 microprocessor is one of the most interesting topic.

What are the functional units of 8085 in microcontroller?

8085 consists of the following functional units − It is an 8-bit register used to perform arithmetic, logical, I/O & LOAD/STORE operations. It is connected to internal data bus & ALU. As the name suggests, it performs arithmetic and logical operations like Addition, Subtraction, AND, OR, etc. on 8-bit data.

What is the configuration of 808085?

8085 is pronounced as “eighty-eighty-five” microprocessor. It is an 8-bit microprocessor designed by Intel in 1977 using NMOS technology. It has the following configuration −. 8-bit data bus; 16-bit address bus, which can address upto 64KB; A 16-bit program counter; A 16-bit stack pointer; Six 8-bit registers arranged in pairs: BC, DE, HL

What is a SP pointer in 8085?

Stack Pointer in 8085 The SP or stack pointer is a 16-bit register and functions similar to a stack, which is constantly increased or decreased with two throughout the push and pop processes. Increment or Decrement Register The 8-bit register contents or else a memory position can be increased or decreased with one.

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