A 8-bit microprocessor signifies that______.

Question

Examoogle · Accepted Answer

8-bit data bus

Explanation: An 8-bit microprocessor is defined by the size of its internal data bus, meaning it can process, move, and perform arithmetic operations on 8 bits of data simultaneously. This classification refers to the word length of the CPU's registers and the width of the data path connecting the CPU to memory and I/O peripherals.

Working Principle: The microprocessor's performance and architecture are categorized by its data bus width, denoted as 'n'. For an 8-bit processor, the ALU can perform operations on data bytes ($2^8 = 256$ possible values) in a single instruction cycle. The data bus acts as the primary highway for transferring these 8-bit packets between the processor, memory, and peripheral devices.

Key Formulas: $N = 2^n$ — where $N$ is the number of distinct data values and $n$ is the bus width; $Memory_{range} = 2^k$ — where $k$ is the width of the address bus

Key Points: Data bus width determines the word size the CPU can process at once.; Address bus width determines the total addressable memory space (e.g., 16-bit address bus allows $2^{16} = 64$ KB of RAM).; 8-bit processors typically operate on bytes ($8$ bits).; Historical examples include the Intel 8085 and Zilog Z80.

Advantages: Low power consumption compared to higher-bit architectures.; Simple architecture and design, suitable for embedded control.

Disadvantages: Limited processing speed for complex mathematical calculations.; Restricted memory addressing capabilities due to smaller address bus sizes.

Applications: Embedded systems; Consumer electronics (washing machines, microwave ovens); Industrial controllers

Additional Info: Option A (Address bus) determines how much memory can be accessed, not the data processing capacity.. Option C refers to hardware interrupt capability, which is independent of the processor's data bus width.. An 8-bit architecture is synonymous with 1-byte data width.

Answer: D is correct — The term '8-bit' microprocessor specifically indicates that the internal data bus width is 8 bits, allowing the processor to handle 1 byte of data per cycle.

Exam Tip: Always distinguish between Data Bus (processing capacity) and Address Bus (memory access capacity); their sizes are often different in the same processor (e.g., 8085 has an 8-bit data bus but a 16-bit address bus).

Related Questions

Discussion (0)