MC9S12XEP100CAL datasheet by Freescale Semiconductor

MC9S12XEP100CAL Frequently Asked Questions (FAQs)

• What is the maximum clock frequency that can be used with the MC9S12XEP100CAL?
  The maximum clock frequency for the MC9S12XEP100CAL is 25 MHz, but it can be overclocked to 30 MHz with some limitations.
• How do I configure the internal oscillator on the MC9S12XEP100CAL?
  The internal oscillator on the MC9S12XEP100CAL can be configured using the OSCCLK and OSCST registers. The OSCCLK register sets the oscillator clock frequency, and the OSCST register sets the oscillator start-up time.
• What is the purpose of the VREFH and VREFL pins on the MC9S12XEP100CAL?
  The VREFH and VREFL pins on the MC9S12XEP100CAL are used to set the reference voltage for the analog-to-digital converter (ADC). VREFH sets the high reference voltage, and VREFL sets the low reference voltage.
• How do I use the watchdog timer on the MC9S12XEP100CAL?
  The watchdog timer on the MC9S12XEP100CAL can be enabled by setting the WDE bit in the WCR register. The watchdog timer can be configured to reset the microcontroller if it does not receive a refresh signal within a certain time period.
• What is the maximum current that can be sourced or sunk by the GPIO pins on the MC9S12XEP100CAL?
  The maximum current that can be sourced or sunk by the GPIO pins on the MC9S12XEP100CAL is 25 mA per pin, with a total current limit of 100 mA for all pins combined.