Task and Objectives
Microcontrollers' firmware can inexpensively improve the electromagnetic compatibility of an embedded system.
Embedded systems firmware is usually not considered to be a source of radio frequency interference. Radio emissions are often caused by harmonic frequencies of the system clock and switching currents. The pulses on these wires can have fast rise and fall times, causing their wires to act as radio transmitters. This effect is increased by badly-designed printed circuit boards. These effects are reduced by using microcontroller output drivers with slower rise times, or by turning off system components.
The microcontroller is easy to control. It is also susceptible to faults from radio frequency interference. Therefore, making the microcontroller's software resist such errors can cheaply improve the system's tolerance for electromagnetic interference by reducing the need for hardware alterations.
Read more about this topic: Immunity-aware Programming
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