Direct memory access and functions of handshake signals

Question

Question 1) What do you mean by interfacing?

Question 2) Describe the concept of Direct Memory Access (DMA) in detail.

Question 3) Describe the functions of Handshake signals in detail.

Question 4) Describe what SIM is. Explain the bit pattern of an accumulator for SIM instruction.

Question 5) Write down the operating modes of the 8155A programmable device.

Question 6) Write a detailed note on any of the applications of microprocessors.

Question 7) Describe the DMA controller 8257?

Question 8) Sketch the block diagram of 8255 and describe it’s working. What do you mean by Control Word? Find out the control word for the configuration of 8255 given below:-

Port A – Output
Mode of port A – Mode 1
Port B – Output
Mode of port B – Mode 0
Port C lower (pins PC0 – PC2) – Output

Question 9) What do you mean by 8254? Describe its different operating modes. Write down its areas of applications.

Question 10) Describe main components of 8259 with the help of appropriate diagram.

Question 11) Describe USART in detail.

Question 12) Describe the functional diagram of keyboard and display controller in detail.

Question 13) Describe the functional diagram of 8155 and describe its control word in detail.