16.4.4.3 Flash Security Register (FTFE_FSEC)
This read-only register holds all bits associated with the security of the MCU and FTFE
module.
During the reset sequence, the register is loaded with the contents of the flash security
byte in the Flash Configuration Field located in program flash memory. The Flash basis
for the values is signified by X in the reset value.
Address: 4002_0000h base + 2h offset = 4002_0002h
Bit
7
6
5
4
3
2
1
0
Read
Write
Reset
* Notes:
x = Undefined at reset.
•
FTFE_FSEC field descriptions
Field
Description
7–6
KEYEN
Backdoor Key Security Enable
These bits enable and disable backdoor key access to the FTFE module.
00
Backdoor key access disabled
01
Backdoor key access disabled (preferred KEYEN state to disable backdoor key access)
10
Backdoor key access enabled
11
Backdoor key access disabled
5–4
MEEN
Mass Erase Enable Bits
Enables and disables mass erase capability of the FTFE module. When the SEC field is set to unsecure,
the MEEN setting does not matter.
00
Mass erase is enabled
01
Mass erase is enabled
10
Mass erase is disabled
11
Mass erase is enabled
3–2
FSLACC
Factory Security Level Access Code
These bits enable or disable access to the flash memory contents during returned part failure analysis at
NXP. When SEC is secure and FSLACC is denied, access to the program flash contents is denied and
any failure analysis performed by NXP factory test must begin with a full erase to unsecure the part.
When access is granted (SEC is unsecure, or SEC is secure and FSLACC is granted), NXP factory testing
has visibility of the current flash contents. The state of the FSLACC bits is only relevant when the SEC bits
are set to secure. When the SEC field is set to unsecure, the FSLACC setting does not matter.
00
Factory access granted
01
Factory access denied
Table continues on the next page...
Chapter 16 Flash Memory Module (FTFE)
Kinetis KE1xZ256 Sub-Family Reference Manual, Rev. 3, 07/2018
NXP Semiconductors
299
Summary of Contents for Kinetis KE1xZ256
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