MK21FX512VLQ12 datasheet by Freescale Semiconductor

MK21FX512VLQ12 Frequently Asked Questions (FAQs)

• What is the maximum operating frequency of the MK21FX512VLQ12?
  The maximum operating frequency of the MK21FX512VLQ12 is 120 MHz.
• How do I configure the clock source for the MK21FX512VLQ12?
  The clock source for the MK21FX512VLQ12 can be configured using the MCG (Multipurpose Clock Generator) module. The MCG allows the user to select between internal clock sources (e.g. IRC48M, IRC4M) or external clock sources (e.g. crystal oscillator, external clock input). The configuration is done through the MCG_C1, MCG_C2, and MCG_C4 registers.
• What is the maximum amount of flash memory that can be programmed on the MK21FX512VLQ12?
  The MK21FX512VLQ12 has 512 KB of flash memory, and the maximum amount of flash memory that can be programmed is 510 KB, leaving 2 KB for the bootloader.
• How do I implement a watchdog timer on the MK21FX512VLQ12?
  The MK21FX512VLQ12 has a watchdog timer module (WDOG) that can be used to reset the microcontroller in case of a software fault. The watchdog timer can be enabled and configured using the WDOG_CS1 and WDOG_CS2 registers. The user needs to periodically refresh the watchdog timer by writing to the WDOG_CS1 register to prevent a reset.
• What is the maximum current consumption of the MK21FX512VLQ12?
  The maximum current consumption of the MK21FX512VLQ12 depends on the operating frequency, voltage, and peripherals used. According to the datasheet, the maximum current consumption is around 350 mA at 120 MHz and 3.3V, with all peripherals enabled.