Answer and Explanation:
POLLING MODE: In polling mode in communication process the processor continually check UART port for data instead of UART port signaling the process through an interrupt when data is ready as is done in interrupt mode.
THE DISADVANTAGES AS COMPARED TO THE INTERRUPT MODE :
the disadvantages in polling mode is that the processor wastes time in checking the UART continually while in interrupt mode it is doing useful task
until the UART interrupt this
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Answer:
By order of increasing magnitude:
D. Make sure the USB device is plugged in properly.
A. Try a different USB cable.
B. Replace the USB device.
C. Install a new USB controller card.
Explanation:
Start with whatever is simplest first. Most errors are simply ID-10-T mistakes.
