MC68HC908GP32CP datasheet by Freescale Semiconductor

MC68HC908GP32CP Frequently Asked Questions (FAQs)

• What is the maximum clock frequency that can be used with the internal oscillator?
  The maximum clock frequency that can be used with the internal oscillator is 8 MHz. However, it's recommended to use a crystal oscillator or an external clock source for frequencies above 4 MHz to ensure stability and accuracy.
• How do I configure the watchdog timer to reset the microcontroller?
  To configure the watchdog timer to reset the microcontroller, you need to set the WDTCLK bit in the WDTCSR register to select the clock source, and then set the WDTPR bits to set the timeout period. Finally, enable the watchdog timer by setting the WDTEN bit.
• Can I use the analog-to-digital converter (ADC) channels as digital inputs?
  Yes, the ADC channels can be used as digital inputs by setting the ADCSC2 register to disable the ADC function and then configuring the pins as digital inputs using the PTAP and PTBP registers.
• How do I implement a delay function using the timer module?
  To implement a delay function using the timer module, you can use the timer overflow interrupt to generate a delay. Set the timer prescaler and counter values to achieve the desired delay, and then enable the timer overflow interrupt. In the interrupt service routine, reset the timer counter and return from the interrupt.
• What is the maximum current that can be sourced or sunk by the I/O pins?
  The maximum current that can be sourced or sunk by the I/O pins is 25 mA. However, it's recommended to limit the current to 10 mA or less to ensure reliable operation and prevent overheating.