An embedded processor is a microprocessor that is used in a device or system to perform a specific function. It is often used in devices that require a lot of computing power, but do not need a full-featured operating system. Embedded processors are often found in devices such as smartphones, industrial control systems, and automotive systems.
A controller, on the other hand, is a device that is used to control and monitor the operation of a system. It may be a separate physical device, or it may be a software program that is used to control the operation of a system. In the context of embedded processors, a controller is often used to manage the operation of the processor and ensure that it is functioning correctly.