MC9S12XD256MAL datasheet by Freescale Semiconductor

MC9S12XD256MAL Frequently Asked Questions (FAQs)

• What is the maximum clock frequency that can be used with this microcontroller?
  The maximum clock frequency for the MC9S12XD256MAL is 25 MHz, but it can be overclocked to 30 MHz with some limitations.
• How do I configure the internal oscillator to generate a clock signal?
  The internal oscillator can be configured using the OSCCTL register. Set the OSCCTL[OSCCLK] bit to 1 to enable the internal oscillator, and then set the OSCCTL[OSCCLKDIV] bits to select the desired clock frequency.
• What is the maximum amount of 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, with a total current limit of 100 mA for all pins combined.
• How do I use the built-in ADC to convert analog signals to digital values?
  The ADC can be configured using the ADCCTL register. Set the ADCCTL[ADICLK] bit to select the clock source, and then set the ADCCTL[ADMODE] bits to select the conversion mode. Use the ADCDATA register to read the converted digital values.
• What is the purpose of the COP (Computer Operating Properly) watchdog timer?
  The COP watchdog timer is used to detect and recover from system failures or hangs. It can be configured to generate a reset signal if the system fails to refresh the COP timer within a specified time period.