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 clocking.
The watchdog timer can be configured using the WCR (Watchdog Control Register). Set the WCR to enable the watchdog timer, and then set the prescaler and timeout values according to your application's requirements.
The COP module is a watchdog timer that monitors the microcontroller's operation and resets the device if it fails to respond within a specified time. This helps prevent the device from getting stuck in an infinite loop or malfunctioning.
The ADC module can be used to convert analog signals to digital values. Configure the ADC by setting the ADCSC1 and ADCSC2 registers, and then start the conversion by setting the ADST bit. The converted value can be read from the ADCRH and ADCRL registers.
The SCI module is a serial communication interface that allows the microcontroller to communicate with other devices using asynchronous serial communication protocols such as UART, SPI, and I2C.