MC9S08QE128CLH datasheet by Freescale Semiconductor

MC9S08QE128CLH Frequently Asked Questions (FAQs)

• What is the maximum operating frequency of the MC9S08QE128CLH?
  The maximum operating frequency of the MC9S08QE128CLH is 20 MHz, but it can be overclocked to 24 MHz with some limitations.
• How do I configure the internal clock source?
  The internal clock source can be configured using the SYNR and REFS registers. The SYNR register sets the clock source, and the REFS register sets the clock frequency.
• What is the purpose of the VLLS (Very Low Leakage Stop) mode?
  The VLLS mode is a low-power mode that reduces power consumption to a minimum. It is used to save power when the device is not in use, and can be used in conjunction with other low-power modes.
• How do I use the ADC (Analog-to-Digital Converter) module?
  The ADC module can be used to convert analog signals to digital values. The ADC can be configured using the ADCSC1 and ADCSC2 registers, and the conversion result can be read from the ADCRH and ADCRL registers.
• What is the difference between the SCI (Serial Communication Interface) and SPI (Serial Peripheral Interface) modules?
  The SCI module is used for asynchronous serial communication, while the SPI module is used for synchronous serial communication. The SCI module is typically used for UART communication, while the SPI module is used for communication with peripherals such as flash memory or sensors.