Question 2 (15 Marks) a) To interface and communicate with external data memory, two signals are issued by the microcontroller 8051. (i) State the symbolic names of these two signals. (ii) Which I/O port is these two pins belong to? (2+2 marks) I b) Two address sizes (in bits) can be supported by the microcontroller 8051 for external data memory interfacing. State two register names and the bit sizes that hold the memory addresses for external data memory interfacing. (4 marks) c) The indirect addressing method holds the actual address used in data transfer for external data memory access for the microcontroller 8051. Write an instruction using the indirect addressing method for copying contents of external data memory via a register location to Accumulator. (2 marks) d) What are the Port numbers that are used by address and data buses for external data memory interfacing for the 8051 microcontrollers? (2 marks) e) The MCS-51 Family microcontrollers can access external program memory under two major conditions (EA=0 or EA 1). Briefly describe these two conditions if 8051 is used. (1.5 +1.5 marks) --End of Question 2---