The maximum clock frequency that can be used with the internal oscillator is 4 MHz. However, it's recommended to use a crystal oscillator or an external clock source for more accurate and stable clock signals.
To configure the ADC to convert analog signals from multiple channels, you need to use the ADC's channel select register (ADCCFG) to select the desired channel. You can also use the ADC's scan mode to convert multiple channels sequentially.
The maximum current that can be sourced or sunk by the GPIO pins is 25 mA. However, it's recommended to limit the current to 10 mA or less to ensure reliable operation and prevent overheating.
To implement a watchdog timer, you need to use the COP (Computer Operating Properly) module. Configure the COP timer to generate a reset signal if the software fails to refresh the COP timer within a specified time period.
The minimum voltage required for the microcontroller to operate reliably is 2.7V. However, it's recommended to operate the microcontroller at a voltage between 3.0V and 3.6V for optimal performance and reliability.