(ii) Show and explain the ADC interfacing with 8085 microprocessor. (8) Orb (b) With functional block diagram, explain the operation and programming of 8251 USART in detail. (16) 14. (a) Discuss about the organization of Internal RAM and Special function registers of 8051 microcontroller in detail. (16) Orb (b) i) Explain the Interrupt structure with the associated registers in 8051 microcontroller. (8) (ii) Explain in detail the modes of operation of Timer unit in 8051 microcontroller. (8) 15. (a) (i) Explain the Data transfer instructions and Program control instructions of 8051 microcontroller. (8)