MC9S12DG256BCPV datasheet by Freescale Semiconductor

MC9S12DG256BCPV Frequently Asked Questions (FAQs)

• What is the maximum clock frequency that can be used with this microcontroller?
  The maximum clock frequency for the MC9S12DG256BCPV 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[OSCSEL] 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 bootloader to program the microcontroller?
  The built-in bootloader can be accessed by holding the MODE pin low during reset. The bootloader can then be used to program the microcontroller using a serial interface such as UART or SPI.
• What is the purpose of the VREGIN pin, and how do I use it?
  The VREGIN pin is used to connect an external voltage regulator to the microcontroller. This allows the microcontroller to generate its own internal voltage supply, which can be useful in certain applications.