Information

28.4.9.3 Flash Commands by Mode

The following table shows the flash commands that can be executed in each flash

operating mode.

Table 28-31. Flash Commands by Mode

FCMD Command

NVM Normal NVM Special

Unsecure Secure MEEN=10 Unsecure Secure MEEN=10

0x00 Read 1s Block × × × × — —

0x01 Read 1s Section × × × × — —

0x02 Program Check × × × × — —

0x03 Read Resource × × × × — —

0x06 Program Longword × × × × — —

0x08 Erase Flash Block × × × × — —

0x09 Erase Flash Sector × × × × — —

0x0B Program Section × × × × — —

0x40 Read 1s All Blocks × × × × × —

0x41 Read Once × × × × — —

0x43 Program Once × × × × — —

0x44 Erase All Blocks × × × × × —

0x45

Verify Backdoor Access

Key

× × × × — —

0x80 Program Partition × × × × — —

0x81 Set FlexRAM Function × × × × — —

28.4.9.4 Allowed Simultaneous Flash Operations

Only the operations marked 'OK' in the following table are permitted to run

simultaneously on the program flash, data flash, and FlexRAM memories. Some

operations cannot be executed simultaneously because certain hardware resources are

shared by the memories. The priority has been placed on permitting program flash reads

while program and erase operations execute on the FlexNVM and FlexRAM. This

provides read (program flash) while write (FlexNVM, FlexRAM) functionality.

Flash Operation in Low-Power Modes

K20 Sub-Family Reference Manual, Rev. 2, Feb 2012

530 Freescale Semiconductor, Inc.