NXP Semiconductors K22F series - Flash Operation in Low-Power Modes; Functional Modes of Operation; Flash Reads and Ignored Writes

29.4.4 Flash Operation in Low-Power Modes
29.4.4.1 Wait Mode
When the MCU enters wait mode, the flash memory module is not affected. The flash
memory module can recover the MCU from wait via the command complete interrupt
(see Interrupts).
29.4.4.2 Stop Mode
When the MCU requests stop mode, if a flash command is active (CCIF = 0) the
command execution completes before the MCU is allowed to enter stop mode.
CAUTION
The MCU should never enter stop mode while any flash
command is running (CCIF = 0).
NOTE
While the MCU is in very-low-power modes (VLPR, VLPW,
VLPS), the flash memory module does not accept flash
commands.
29.4.5
Functional Modes of Operation
The flash memory module has two operating modes: NVM Normal and NVM Special.
The operating mode affects the command set availability (see Table 29-2). Refer to the
Chip Configuration details of this device for how to activate each mode.
29.4.6
Flash Reads and Ignored Writes
The flash memory module requires only the flash address to execute a flash memory
read.
Chapter 29 Flash Memory Module (FTFA)
K22F Sub-Family Reference Manual, Rev. 4, 08/2016
NXP Semiconductors 651