MC9S08AC48CFUE datasheet by Freescale Semiconductor

MC9S08AC48CFUE Frequently Asked Questions (FAQs)

• What is the maximum clock frequency that can be used with this microcontroller?
  The maximum clock frequency for the MC9S08AC48CFUE is 20 MHz, but it can be overclocked to 24 MHz with some limitations.
• How do I configure the internal clock oscillator?
  The internal clock oscillator can be configured using the CLKSEL register. The clock source can be selected from the internal oscillator, external oscillator, or the PLL. The clock frequency can be divided using the CLKDIV register.
• What is the maximum amount of current that can be sourced or sunk by the GPIO pins?
  The maximum amount of current that can be sourced or sunk by the GPIO pins is 25 mA. However, the total current sourced or sunk by all GPIO pins should not exceed 100 mA.
• How do I use the ADC module?
  The ADC module can be used by configuring the ADCSC1 and ADCSC2 registers to select the channel, clock, and conversion mode. The ADC result can be read from the ADCRH and ADCRL registers.
• What is the purpose of the COP (Computer Operating Properly) module?
  The COP module is a watchdog timer that resets the microcontroller if it does not receive a refresh signal within a certain time period. This is used to prevent the microcontroller from getting stuck in an infinite loop or malfunctioning.