MC9S08AC16CFDE datasheet by Freescale Semiconductor

MC9S08AC16CFDE 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 16 MHz, but it's recommended to use 8 MHz or lower for optimal performance and to minimize power consumption.
• How do I configure the watchdog timer to reset the MCU in case of a fault?
  To configure the watchdog timer, you need to set the WDTCLK register to select the clock source, set the WDTCNT register to set the timeout period, and enable the watchdog timer by setting the WDTEN bit in the WDTCTL register.
• Can I use the ADC module to measure voltages above 5V?
  No, the ADC module can only measure voltages between 0V and VREF (which is typically 5V). If you need to measure higher voltages, you'll need to use an external voltage divider or attenuator to bring the voltage within the ADC's range.
• How do I implement a delay function using the timer module?
  You can implement a delay function by setting the timer module to count up to a specific value, and then using the timer overflow flag to trigger an interrupt. In the interrupt service routine, you can reset the timer and perform the desired action.
• What is the maximum current that can be sourced or sunk by the GPIO pins?
  The maximum current that can be sourced or sunk by the GPIO pins is 25 mA per pin, but it's recommended to limit the current to 10 mA or less to ensure reliable operation and to prevent overheating.