difference between a micro controller and a micro processor, and a central processing unit?
micro controller, it will be microcontroller, control oriented processor
micro processor, it will be microprocessor, general purposes processor
CPU, its definition depends to system. In a microprocessor system, it is the other name of microprocessor, but in a PLC, Programmable Logic Controller, system CPU includes RAM, ROM memory and also the microprocessor. Kind regards. Have fun.

Nutty Blue