NXP Semiconductors K22F series, Reference Manual, Page: 295 / 1407

13.3 Functional Description
The following sub-sections describe the Kinetis Flashloader functionality.
13.3.1 Memory Maps
While executing, the Kinetis Flashloader uses RAM memory.
The Kinetis Flashloader requires a minimum memory space of 32 KB of RAM. For
Kinetis devices with less than this amount of on-chip RAM, the Kinetis Flashloader is not
available.
13.3.2 Start-up Process
As the Kinetis Flashloader begins executing, flashloader operations begin:
1. The flashloader’s temporary working area in RAM is initialized.
2. All supported peripherals are initialized.
3. The flashloader waits for communication to begin on a peripheral.
• There is no timeout for the active peripheral detection process.
• If communication is detected, then all inactive peripherals are shut down, and the
command phase is entered.
Chapter 13 Kinetis Flashloader
K22F Sub-Family Reference Manual, Rev. 4, 08/2016
NXP Semiconductors 295