How data is transferred between the microprocessor and I O devices?

This type of data transfer technique is known as DMA or direct memory access. During DMA the CPU is idle and it has no control over the memory buses. The DMA controller takes over the buses to manage the transfer directly between the I/O devices and the memory unit. DMA returns the bus after complete data transfer.

How does a microprocessor communicate with other devices?

To communicate with a particular device, the processor places a device address on address lines. Each Interface decodes the address and control received from the I/O bus, interprets them for peripherals and provides signals for the peripheral controller.

In which technique data are exchanged between the processor and the I O module?

With programmed I/O, data are exchanged between the processor and the I/O module. The processor executes a program that gives it direct control of the I/O operation, including sensing device status, sending a read or write command, and transferring the data.

How can the microprocessors be connected to external devices?

The microprocessor is provided with an interface arrangement for connecting the microprocessor to the external circuit device wherein the interface arrangement includes data buses which are an extension of at least a portion of the data buses of the arithmetic section in the microprocessor.

Which part of the computer is responsible to transfer data between IO and main memory?

DMA module
DMA module itself controls exchange of data between main memory and the I/O device.

What are two ways for the processor to send information to an I O device?

There are three approaches available to communicate with the CPU and Device.

• Special Instruction I/O.
• Memory-mapped I/O.
• Direct memory access (DMA)

What is io microprocessor?

The input-output (I/O) devices or peripherals provide the necessary data communications link between the microprocessor and its environment. Typically, information is accepted from the input devices, it is processed and the results of the data processing are then sent to one or more output devices.

What are the different techniques of data transfer in the I O subsystem of a computer?

either programmed or interrupt-driven I/O. performance. o Can handle multiple devices at the same time o Byte multiplexor – used for low-speed devices o Block multiplexor – interleaves blocks of data from several devices.

What input devices can be connected to the microprocessor microcontroller?

In a microprocessor, ROM (read-only memory) and RAM (random access memory) are used. A data input device. The keyboard and mouse of a PC, for example, are data input devices. With a built-in controller, switches and sensors are input devices.

Which of the data transfer is not possible in microprocessor?

Memory to Memory transfer is not possible in microprocessor thats why the instruction MOV M,M is not valid in microprocessor.

How to transfer data from CPU to I/O devices?

Data transfer between CPU and the I/O devices may be done in different modes. Data transfer to and from the peripherals may be done in any of the three possible ways Programmed I/O. Interrupt- initiated I/O. Direct memory access ( DMA). Now let’s discuss each mode one by one.

How is data transferred from one device to another?

Each data item transfer is initiated by an instruction in the program. Usually the transfer is from a CPU register and memory. In this case it requires constant monitoring by the CPU of the peripheral devices. Example of Programmed I/O: In this case, the I/O device does not have direct access to the memory unit.

Why do we need a microprocessor for data transfer?

A microprocessor is not used merely for running simple arithmetic operations or logical functionality. It also performs many Input-Output actions, data transfer functions, and a lot more! Why is Data Transfer needed? Why is Data Transfer needed? We can connect several I/O devices and memory peripherals to a microprocessor.

How does a microprocessor communicate with an I/O device?

Once the speeds match, the data transfer immediately begins, once a signal is issued by the microprocessor to begin transferring. The microprocessor need not wait for an extended period because of the matching speeds. This technique of data transfer is seldom used to communicate with I/O devices though.