M6800 vs. M6802

What's the Difference?

The M6800 and M6802 are both microprocessors developed by Motorola in the 1970s. The M6800 is an 8-bit microprocessor with a 64 KB address space and a clock speed of up to 1 MHz. It was widely used in early personal computers and industrial applications. The M6802, on the other hand, is an enhanced version of the M6800 with additional features such as an on-chip clock generator and a built-in serial interface. It also has a larger 128 KB address space and a faster clock speed of up to 2 MHz. Overall, the M6802 offers improved performance and functionality compared to the M6800.


Year of Release19741977
Instruction SetM6800M6802
Memory Addressing64 KB64 KB

Further Detail


Microprocessors are the heart of any computing device, from smartphones to laptops to industrial machinery. Two popular microprocessors from the 1970s are the M6800 and M6802. While they may seem similar at first glance, there are key differences in their attributes that make them suitable for different applications.


The M6800 and M6802 microprocessors are both based on the same 8-bit architecture. However, the M6802 has a few enhancements that set it apart from the M6800. One notable difference is the addition of a hardware multiply instruction in the M6802, which allows for faster arithmetic operations compared to the M6800. This makes the M6802 more suitable for applications that require intensive mathematical calculations.


When it comes to memory, the M6800 and M6802 have similar capabilities. Both microprocessors support up to 64 KB of addressable memory, which was sufficient for most applications at the time. However, the M6802 has a slightly different memory map compared to the M6800, which may affect how developers design their software for each microprocessor. Overall, the memory capabilities of both microprocessors are adequate for most applications.

Instruction Set

The instruction set of a microprocessor determines the operations it can perform and how efficiently it can execute them. The M6800 and M6802 share a common instruction set, with the M6802 adding a few additional instructions for enhanced functionality. These new instructions allow developers to optimize their code for the M6802, making it more efficient in certain scenarios compared to the M6800. However, for most general-purpose applications, the differences in the instruction set may not be significant.

Peripheral Support

Peripheral support is crucial for microprocessors used in embedded systems and other applications that require interaction with external devices. Both the M6800 and M6802 have similar capabilities when it comes to interfacing with peripherals such as timers, serial ports, and interrupt controllers. However, the M6802 may have better support for certain peripherals due to its enhanced architecture and instruction set. Developers should consider the specific requirements of their application when choosing between the two microprocessors.

Power Consumption

Power consumption is a critical factor in many applications, especially those that are battery-powered or require low heat dissipation. The M6802 is known for its lower power consumption compared to the M6800, making it a better choice for applications where energy efficiency is a priority. This difference in power consumption may be attributed to the enhancements in the M6802's architecture, which allow it to perform the same tasks as the M6800 while consuming less power.


Cost is always a consideration when choosing a microprocessor for a project. The M6800 and M6802 are both affordable options, with the M6800 being slightly cheaper due to its simpler architecture. However, the cost difference between the two microprocessors may not be significant in the grand scheme of a project's budget. Developers should weigh the performance and features of each microprocessor against their cost to determine the best fit for their application.


In conclusion, the M6800 and M6802 microprocessors have their own strengths and weaknesses that make them suitable for different applications. While the M6802 offers enhancements in terms of architecture, instruction set, and power consumption, the M6800 may be a more cost-effective option for simpler projects. Developers should carefully evaluate their requirements and consider the attributes of each microprocessor before making a decision. Ultimately, both the M6800 and M6802 are capable microprocessors that have stood the test of time in the world of computing.

Comparisons may contain inaccurate information about people, places, or facts. Please report any issues.