Computer Organization and Microprocessor Architecture

Study Notes

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.

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.