40.2 Operation in Noisy Environment

If the device is operating in an environment with significant electromagnetic noise, it must be protected from this noise to ensure reliable operation. In addition to following best practice EMC design guidelines, the recommendations listed in the schematic checklist sections must be followed. In particular, placing decoupling capacitors very close to the power pins, an RC-filter on the RESET pin, and a pull-up resistor on the SWCLK pin are critical for reliable operations. A weak pull-up resistor is also recommended on the SWDIO pin. It is also important to eliminate or attenuate noise to prevent it from reaching supply pins, I/O pins, and crystals.

Refer to the EMI, EMC, EFT and ESD Circuit Design Consideration for 32-bit Microcontrollers guide on the Microchip website, www.microchip.com.