Computer Organization and Microprocessor Architecture

Computer Organization and Microprocessor Architecture

• Objective Type Questions:
  • Interrupt examples for 8085 microprocessor include CLK, ALE, SOD, and TRAP.
  • Memory addressable by 8085 microprocessors ranges from 0000H to FFFFH.
  • The Arithmetic Logic Unit (ALU) capacity in 8085 is 8 bits.
  • Program counter stores the address of next instruction.
  • Stack pointer is a 16-bit register.
  • Carry flag reflects the status of 4 least significant bits (LSBs).
  • Status pins SO and S1 represent status in 8085 microprocessor.
  • Instruction MOV A, B is an 8-bit instruction in 8085.
  • STA address (store accumulator) instruction uses register addressing mode.
  • Stack memory is a type of memory.
  • ADC M (add memory to accumulator) is an example of an instruction in 8085.
  • A 1K x 8 memory IC has 10 address lines and 8 data lines.
  • A non-maskable interrupt in 8085 is the interrupt that cannot be disabled.

Questions:

• Flags in Operation: Details on flag status for different arithmetic operations (96H + FFH, C1H + 32H, D1H + 33H, etc.) should be covered, likely in a table format.

• Instruction Formats: Explanation for 1-byte, 2-byte, and 3-byte instruction examples in 8085.

• Addressing Modes: Explanation of addressing modes like direct (LDA), register (RAL), immediate (STA, ADC M), and register pair (LXI) should include details for examples provided (LDA address; RAL; STA address; ADC M; LXI Rp, 16-bit).

• Buses in 8085: Details describing address, data, and control buses, including their functionalities should be included.

• 8085 Registers and Usage: The number and functions of registers in 8085 microprocessor should be outlined.

• Interfacing Diagram: The diagram of interfacing a 4K byte SRAM with an 8085 microprocessor for memory addressing (start address at 4000H) should be included.

• Micro-operations: Definitions for micro-operations in a computer system should be discussed, with examples (4 micro operations).

• 8085 Internal Architecture: A block diagram of 8085 that outlines its internal components, including registers, ALU, and other sections. Include the CPU's internal architecture.

• PUSH and POP Instructions: Explanation of stack operations (PUSH and POP) with illustrations and diagrams.