Microcontrollers have been in the semiconductor industry for two decades, and the technology has undergone modifications over the years to suit the evolving needs of customers. An interesting trend that has enabled the growth of the microcontrollers market is the increasing number of applications in various segments. Starting with lower bit cores of 4 and 8, the market has now reached a stage where even 64-bit microcontrollers are being used in certain high-end applications. The 4-bit microcontrollers have almost been phased out.