Right tool right job Self contained Limited resources Used for a specific job Low power Low cost Needs Chipsets Large Memory, fast clock rates More general purpose Requires more power More expensive MicrocontrollerMicroprocessor
What does the iPhone use?
iPhone 3GS Internals
iPhone 4S & iPhone 5 Circuit
Mixed Design Sometimes called System on a Chip (SoC) MCUMPU
SoC = A more powerful MCU but with less integration than an MCU