Computer buses: Which of the following is NOT a standard bus type used in microprocessor systems?

Introduction / Context:
Microprocessor systems communicate over well-defined buses. Knowing the canonical bus types clarifies system diagrams and helps troubleshoot hardware issues involving signal lines and timing.

Given Data / Assumptions:

• Standard buses in basic systems include data, address, and control buses.
• Specialized peripherals may include timer modules but not a separate ”timer bus”.
• We consider foundational bus taxonomy, not proprietary interconnect names.

Concept / Approach:
The data bus transfers data values; the address bus selects memory or I/O locations; the control bus carries control signals (e.g., read/write strobes, clock, interrupts). ”Timer bus” is not a standard category; timers are peripherals connected via the existing buses.

Step-by-Step Solution:
List canonical buses: data, address, control.Check ”timer bus”: not part of the canonical set; timers are mapped on the existing buses.Therefore, ”timer bus” is not a standard bus type.Select: timer bus.

Verification / Alternative check:
Reference any introductory computer organization text: the three-bus model (address, data, control) is foundational and widely taught.

Why Other Options Are Wrong:
Data, address, control buses are essential and ubiquitous in processor architectures.

Common Pitfalls:
Mistaking a peripheral function (timers) for a separate interconnect category.

Final Answer:
timer bus