Interfacing

Question 1

Why do we use a transport latch and flip flop?

Answer 1

To guard against metastability

Question 2

Why does I/O implement a clearing/setting bit

Answer 2

To Create a Clock

Question 3

What to do if the microcontroller needs more pins?

Answer 3

• Could implement multiplexing.
• Alternatively, could use a bus…
• Most microcontrollers don’t have a bus, but some AVRs do

Question 4

What is a bus?

Answer 4

A bus is a communication system that transfers data between components inside a computer, or between computers.

Question 5

Describe Address Bus features

Answer 5

• Location of the memory cell to access

Question 6

Describe Data Bus

Answer 6

• Contents of memory cell (read/write)

Question 7

Describe Control Bus

Answer 7

• Carries all the signals necessary for data and
address bus to function.
• Read and write signals