Difference Between 8 Bit and 16 Bit Microcontroller

A microcontroller is a chip that contains a processor. It basically gives the processor something to read from. Without a microcontroller, a processor is basically empty.

So, in an 8-bit microcontroller, there are 8 pieces of information that it can read. A 16-bit microcontroller is 16 bits, 32 bits is 32 bits, etc.

8 Bit vs 16 Bit Microcontroller

The main difference between 8 Bit and 16 Bit Microcontroller is that an 8-bit Microcontroller can only handle 8-bit Data and 8-bit Program Memory. A 16-bit Microcontroller can handle 16-bit Data and Program Memory. This makes them stand apart in their efficiency and functionality.

8 Bit vs 16 Bit Microcontroller

An 8-bit microcontroller is a microcontroller whose data word length is 8 bits. The number of bits that the microprocessor can process at one time is known as the word length or word size of the microprocessor.

A 16-bit microcontroller typically refers to a microcontroller that can handle data with 16 bits, so it’s able to handle a larger amount of data and calculations at once.

It also works in comparatively lesser current and has a higher clock speed than an 8-bit microcontroller. It is the most commonly used microcontroller today.

Comparison Table Between 8 Bit and 16 Bit Microcontroller

Parameters of Comparison8 Bit Microcontroller16 Bit Microcontroller
Reading Bus8-bit microcontrollers have an 8-bit reading bus.A 16-bit microcontroller has a 16-bit reading bus.  
Clock Speed8-bit microcontrollers generally have a slower clock speed but are stable.16-bit microcontrollers tend to have double the clock speed but are not as stable.
Efficiency8-bit microcontrollers are not as comparatively efficient as 16-bit microcontrollers.16-bit microcontrollers are more efficient in comparison to 8-bit microcontrollers.
ROM8-bit microcontrollers require a higher ROM.16-bit microcontrollers require a lesser ROM.
Space8-bit microcontrollers take up less space than 16-bit microcontrollers.16-bit microcontrollers take up more space than 8-bit microcontrollers.

What is 8 Bit Microcontroller?

Microcontrollers are devices nowadays used in industrial applications, wherein they are embedded in equipment and appliances to provide control, data processing, and other features that are not readily available.

An 8-bit microcontroller is a bit processor, and this processor operates in 8-bit mode. This means it can read 8 pieces of information at once.

8-bit microcontrollers are an essential part of embedded systems. They are widely used for industrial applications and increasingly for domestic appliances.

They are typically used for small applications with few inputs and outputs, such as motor control, miniature washing machines, glue dispensers, and remote-controlled toy cars.

 They are also widely used in modern vending machines, such as bill validators and ticket machines. An 8-bit processor is a microprocessor that has 8 bits of address space, 8-bit data, and 8-bit instruction.

The first microprocessor (4004) was 8-bit. These days, most (but not all) microprocessors are 32-bit.

It works at a clock speed of 4 MHz, which is much slower than 16-bit microcontrollers; however, it requires less energy to function and thus helps you conserve more energy upon the usage of the device containing the 8-bit microcontroller in comparison to 16-bit microcontrollers.

8-bit microcontrollers also have a smaller ROM and RAM requirement. This makes them not only friendly for a number of devices but also makes them beginner-friendly in comparison to a 16-bit microcontroller which is more advanced.

What is 16 Bit Microcontroller?

The microcontroller processes data and inputs received from the peripheral devices. It also sends instructions to the output peripherals based on the processed data.

A microcontroller is a great option for embedded systems because it is less expensive and does not consume much power.

The 16-bit microcontroller can also be referred to as a CPU. The definition of a 16-bit controller is a processor that operates on 16 bits at a given time.

This includes instructions, data, and addresses. 16-bit controllers are often seen in advanced machines and electronic devices.

 Many phones and computers use 16-bit controllers. If the product does need assistance in multitasking, then a 16-bit controller would be more ideal for the product than a 32-bit or 64-bit controller.

A 16-bit microcontroller is one that has between 16 and 32 kilobytes of memory, allowing it to operate faster and have more memory capacity than an 8-bit microcontroller.

A 16-bit microcontroller is one of the most common types of microcontrollers. They are used in all sorts of common electronics, including microwave ovens, washing machines, and video games.

They work similar to a central processing unit in a computer, but they can only handle a minimum of 16 things at the same time.

Main Differences Between 8 Bit and 16 Bit Microcontroller

  1. 8-bit microcontrollers can usually process a maximum of 64 kilobytes at once, but some are limited to 16 kilobytes. 16-bit microcontrollers usually can process 65,536 bytes at once.
  2. An 8-bit microprocessor has eight-bit words, while a 16-bit microprocessor has 16-bit words.
  3. 8-bit microcontrollers are typically used in smaller systems and are lower in price than 16-bit microcontrollers.
  4. 8-bit microcontrollers have eight bits, which are a binary number that can be represented as “0000”, “0001”, “0010”, “0011”, “0100”, “0101”, “0110”, and “0111”. 16-bit microcontrollers on the other hand have 16 bits, which can be represented as “0000”, “0001”, “0010”, “0011”, “0100”, “0101”, “0110”, “0111”, “1000”, “1001”, “1010”, “1011”, “1100”, “1101”, and “1110”.
  5. 8-bit processors use small memories that can be erased in-system. 16-bit processors use larger memories that cannot be erased in-system
Difference Between 8 Bit and 16 Bit Microcontroller


If you’re looking for a way to save power in your project, a microcontroller might be the best solution. You might want to consider the speed and ROM requirements of your device, however.

Each microcontroller has its own set of parameters, so you want to make sure you’re choosing the right one.

A microcontroller with a higher word size can process more data faster than one with a smaller word size. The two types of microcontrollers have different external bus protocols.

8-bit processors have a simple 3-wire bus, and 16-bit processors have a complex 2-wire bus. Thus you should choose whatever suits your needs best.


  1. https://link.springer.com/article/10.1007/s10623-015-0087-1
  2. https://ieeexplore.ieee.org/abstract/document/1287158/
  3. https://ww1.microchip.com/downloads/en/DeviceDoc/doc7926.pdf
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