Cache usage is a common mechanism for increasing the speed and performance of memory access and are widely used from simple microprocessors to the complex multi core-based designs. It is seen that the cache is not well designed for the embedded systems as the performance is based on probability and is not deterministic. It is difficult to guarantee the time a data will be present or absent in the cache memory. So, it becomes difficult for the embedded system to use the ability of cache to increase the performance. Normally, many real-time systems simply switch off the cache technique and use the scheduler algorithm based on the worst time memory access. There is various software stack that provides the advantage of cache time without the limitation that a hardware-based cache offers. The paper talks about the different organization and operations of cache techniques found in generally used processors, signal processing units and microcontrollers.