The internal oscillator can be configured to run up to 64 MHz, but the maximum achievable frequency may vary depending on the specific device and operating conditions. Typically, it's recommended to use an external crystal oscillator for frequencies above 40 MHz.
To achieve the highest possible accuracy with the ADC, ensure that the analog input voltage is within the recommended range (typically 0 to VCC), use the internal voltage reference, and select the correct ADC clock frequency. Additionally, consider using the ADC's built-in calibration feature and averaging multiple conversions to reduce noise.
The maximum current that can be sourced or sunk by the GPIO pins is typically limited to 20 mA per pin, with a total current limit of 100 mA for all GPIO pins combined. However, it's recommended to check the specific device datasheet for exact current limits and to use external buffers or drivers for higher current requirements.
To implement a WDT reset, enable the WDT by setting the WDTE bit in the WDT control register. Then, periodically reset the WDT by writing a specific value to the WDT reset register. If the WDT is not reset within the timeout period, a system reset will be generated.
The BOR feature is designed to reset the microcontroller in case of a power supply voltage drop (brown-out). When the supply voltage falls below a certain threshold, the BOR circuitry generates a system reset, ensuring that the microcontroller is properly initialized and preventing unpredictable behavior.
