MK20DX256VLK7R datasheet by Freescale Semiconductor

MK20DX256VLK7R Frequently Asked Questions (FAQs)

• What is the maximum operating frequency of the MK20DX256VLK7R?
  The maximum operating frequency of the MK20DX256VLK7R is 72 MHz.
• How do I configure the clock source for the MK20DX256VLK7R?
  The clock source for the MK20DX256VLK7R 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 available on the MK20DX256VLK7R?
  The MK20DX256VLK7R has 256 KB of flash memory available for program storage.
• How do I implement a watchdog timer on the MK20DX256VLK7R?
  The MK20DX256VLK7R has a built-in watchdog timer (WDOG) module. To implement a watchdog timer, the user needs to configure the WDOG_CS1 register to set the timeout period, and then enable the watchdog timer by setting the WDOG_CS2 register. The watchdog timer can be reset by writing to the WDOG_CS3 register.
• What is the purpose of the VLLS (Very Low Leakage Stop) mode on the MK20DX256VLK7R?
  The VLLS mode is a low-power mode on the MK20DX256VLK7R that reduces power consumption to a minimum. In VLLS mode, the CPU, peripherals, and most of the internal logic are powered down, and the device can only be woken up by an external interrupt or a reset event.