NXP Semiconductors KL25 Series - Flash Reads and Ignored Writes

27.4.5 Flash Reads and Ignored Writes
The flash memory module requires only the flash address to execute a flash memory
read.
The MCU must not read from the flash memory while commands are running (as
evidenced by CCIF=0) on that block. Read data cannot be guaranteed from a flash block
while any command is processing within that block. The block arbitration logic detects
any simultaneous access and reports this as a read collision error (see the
FSTAT[RDCOLERR] bit).
27.4.6 Read While Write (RWW)
The following simultaneous accesses are not allowed:
• Reading from program flash memory space while a flash command is active
(CCIF=0).
27.4.7 Flash Program and Erase
All flash functions except read require the user to setup and launch a flash command
through a series of peripheral bus writes. The user cannot initiate any further flash
commands until notified that the current command has completed. The flash command
structure and operation are detailed in Flash Command Operations.
27.4.8 Flash Command Operations
Flash command operations are typically used to modify flash memory contents. The next
sections describe:
• The command write sequence used to set flash command parameters and launch
execution
• A description of all flash commands available
Chapter 27 Flash Memory Module (FTFA)
KL25 Sub-Family Reference Manual, Rev. 3, September 2012
Freescale Semiconductor, Inc. 435