28 May '16, 11am

Microcontrollers vs Microprocessors

Microcontrollers vs Microprocessors

An attribute that is difficult to determine is the required processing performance any given design might require. Processing power, measured in terms of Dhrystone MIPS (DMIPS), helps quantify these criteria. For example, an ARM Cortex-M4-based microcontroller such as Atmel’s SAM4 MCU is rated at 150 DMIPS while an ARM Cortex-A5 application processor (MPU) such as Atmel’s SAMA5D3 can deliver up to 850 DMIPS. One way of estimating the DMIPS required is by looking at the parts of the application that may be performance hungry. Running a full operating system (OS), such as Linux, Android or Windows CE, for your application would demand at least 300–400 DMIPS. For many applications, a straightforward RTOS might suffice and an allowance of 50 DMIPS would be more than adequate. Using an RTOS also has the benefit that it requires little memory space; a kernel of just a few kB bei...

Full article: http://electronicsforu.com/resources/microcontrollers-vs-...

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