(a) What are the different operating modes of 8255? Explain any one operating mode of 8255. (b) Write control word in mode 0 operation for the following cases: (i) Port A = input port, Port B =...

(a) What are the different operating modes of 8255? Explain any one operating mode of 8255.

(b) Write control word in mode 0 operation for the following cases:

(i) Port A = input port, Port B = output port, Port C = output port

(ii) Port A = input port, Port B = output port, Port CU = output port, Port CL = input port

(c) Explain the importance of GATE signal in 8253. How is it used to control the operation of

counters?