A processor has 8-bit data bus width. How many times does it needed to read a 28-bit data into the processor? What if the processor has a 32-bit data bus? USB is the most common serial bus. It can...

A processor has 8-bit data bus width. How many times does it needed to read a 28-bit data into the processor? What if the processor has a 32-bit data bus?

USB is the most common serial bus. It can connect many computer peripherals. Is it possible to use it as the video interface, why?