Microprocessor · Unit 2 · 7 hrs
Basic Architecture
Exam-focused notes for Basic Architecture (Microprocessor, CSC167): what the TU syllabus asks and how it has actually been tested, with 9 solved past questions from this unit.
What this unit covers
- Microprocessor Architecture and Operations
- Memory
- I/O devices
- Memory and I/O operations
- 8085 Microprocessor Architecture
- Address, Data And Control Buses
- 8085 Pin Functions
- Demultiplexing of Buses
- Generation Of Control Signals
8085 Microprocessor Architecture
Explain the internal architecture of 8085 microprocessor with labeled block diagram.[10]
The 8085 is an 8-bit microprocessor manufactured by Intel. It has an 8-bit data bus and a 16-bit address bus, capable of addressing 64 KB of memory. Its internal architecture consists of several functional units that work together to fetch, decode, and exec...
Full solved answer →Memory and I/O operations
Explain different types of IO instructions. Differentiate between I/O mapped and memory mapped I/O. [5]
I/O instructions are used by the CPU to communicate with input/output devices (peripherals). The main types are: - Transfers data from an I/O device (port) to the CPU (typically the accumulator). - The CPU reads data from the specified I/O port address. - E...
Full solved answer →Demultiplexing of Buses
What is ALE? Explain the role of ALE in address/data bus De-multiplexing in 8085 with suitable diagram. [5]
ALE (Address Latch Enable) is a control signal generated by the 8085 microprocessor during the first clock cycle (T1) of every machine cycle. It is an active-high output signal that indicates the lower 8-bit address (A0-A7) is present on the multiplexed Add...
Full solved answer →What are the different kinds buses? How and why de-multiplexing of buses is carried out in 8085. [5]
A bus is a group of conducting wires (fine thin lines) that connects different parts of a microprocessor system and carries signals between them. There are three types of buses: --- - A group of conducting wires that carries address only (address of a memor...
Full solved answer →What is the use of $AD_7-AD_0$ in 8085 microprocessor? Explain address de-multiplexing process in 8085 microprocessor with suitable diagram. [5]
--- The 8085 microprocessor has only 40 pins. To reduce the pin count while still supporting a 16-bit address bus and an 8-bit data bus, Intel used a technique called multiplexing. The pins AD₇-AD₀ serve a dual purpose: Time Period Function ------ First hal...
Full solved answer →Write the process of address and data separation in De-multiplexed address/data bus in 8085 microprocessor. [5]
The 8085 microprocessor has only 40 pins. To reduce the pin count, Intel multiplexed the lower 8 bits of the address bus with the 8-bit data bus on the same set of pins, labeled AD0 - AD7. This means the same physical pins carry address information at one t...
Full solved answer →Difference between 8085 and 8086 microprocessor. Explain the concept of demultiplexing of address bus and why is it required?[10]
--- Feature 8085 Microprocessor 8086 Microprocessor --------- Data Bus Width 8-bit data bus 16-bit data bus Address Bus Width 16-bit address bus 20-bit address bus Addressable Memory 2^16 = 64 KB 2^20 = 1 MB Word Size 8-bit (processes 8 bits at a time) 16-b...
Full solved answer →Generation Of Control Signals
Draw a logic diagram showing generation of memory and I/O read/write control signals in 8085 microprocessor. [5]
The 8085 microprocessor generates four main control signals for memory and I/O operations using its primary control pins: Pin Function --------------- RD (active low) Read strobe - indicates read operation WR (active low) Write strobe - indicates write oper...
Full solved answer →Microprocessor Architecture and Operations
Write short notes on:a) Von Neumann architecture b) Macro Assembler [5]
--- Von Neumann architecture (also called the stored-program concept) is a computer design model in which both program instructions and data are stored in the same memory unit. It forms the foundation of most modern computers and microprocessors. Component ...
Full solved answer →Make Unit 2 stick
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