c) Q2. (a) (b) Identify the addressing modes for the following 8085 microprocessor instructions. i) ii)...

  
 

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c) Q2. (a) (b) Identify the addressing modes for the following 8085 microprocessor instructions. i) ii) 111) CMP B LDAX B LXI B, 2100H [3 Marks] Identify the contents of the flag register after the execution of the following arithmetic instruction: MVI B, 4EH MVI A, 85H SUB B [5 Marks] Figure 2(c) shows the system address bus of the 8085 microprocessor being interfaced with 8255 Programmable Peripheral Interface (PPI). (c) Figure 2(c) shows the system address bus of the 8085 microprocessor being interfaced with 8255 Programmable Peripheral Interface (PPI). (ii) A2 (iii) A7 AO A1 AO A1 CS 8255 Port A Port C Figure 2(c) Analyse the following in the above interfacing circuit: (i) the interfacing technique used Port B the Port A, B, C, and the control word address the Control word if the system is operated in mode 0 [2 marks] [8 Marks] [2 marks] (d) Outline the timing diagram for the following immediate addressing mode instruction and clearly indicate the clock, address, data, and control and status signals. Memory address 9000H 9001H Machine code 3 Ен 88H Mnemonics MVI A,88H [10 Marks] c) Q2. (a) (b) Identify the addressing modes for the following 8085 microprocessor instructions. i) ii) 111) CMP B LDAX B LXI B, 2100H [3 Marks] Identify the contents of the flag register after the execution of the following arithmetic instruction: MVI B, 4EH MVI A, 85H SUB B [5 Marks] Figure 2(c) shows the system address bus of the 8085 microprocessor being interfaced with 8255 Programmable Peripheral Interface (PPI). (c) Figure 2(c) shows the system address bus of the 8085 microprocessor being interfaced with 8255 Programmable Peripheral Interface (PPI). (ii) A2 (iii) A7 AO A1 AO A1 CS 8255 Port A Port C Figure 2(c) Analyse the following in the above interfacing circuit: (i) the interfacing technique used Port B the Port A, B, C, and the control word address the Control word if the system is operated in mode 0 [2 marks] [8 Marks] [2 marks] (d) Outline the timing diagram for the following immediate addressing mode instruction and clearly indicate the clock, address, data, and control and status signals. Memory address 9000H 9001H Machine code 3 Ен 88H Mnemonics MVI A,88H [10 Marks]

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CLK ALE ARAU ASA15 RD 7 10M So ... View the full answer