Question

Which of the following statements regarding interface circuit are correct?

1. Electrical buffering is needed when the peripheral operates at a different voltage or current to that on the microprocessor bus system or there are different ground references.

2. Timing control is needed when the data transfer rates of the peripheral and the microprocessor are different.

3. Changing the number of lines is needed when the codes used by the peripherals differ from those used by the microprocessor.

1. 1 and 2 only 
2. 1 and 3 only 
3. 2 and 3 only 
4.

1, 2 and 3

Answer 1

Correct Answer - Option 1 : 1 and 2 only 

Concept:

Electrical buffering is needed when the peripheral operates at a different voltage or current to that on the microprocessor bus system or there are different ground references.

Timing control is needed when the data transfer rates of the peripheral and the microprocessor are different.

Code conversion is needed when the codes used by the peripherals differ from those used by microprocessor