FTFE_FSEC field descriptions (continued)
Field
Description
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
10
Factory access denied
11
Factory access granted
SEC
Flash Security
These bits define the security state of the MCU. In the secure state, the MCU limits access to FTFE
module resources. The limitations are defined per device and are detailed in the Chip Configuration
details. If the FTFE module is unsecured using backdoor key access, the SEC bits are forced to 10b.
00
MCU security status is secure
01
MCU security status is secure
10
MCU security status is unsecure (The standard shipping condition of the FTFE is unsecure.)
11
MCU security status is secure
17.4.4.4 Flash Option Register (FTFE_FOPT)
The flash option register allows the MCU to customize its operations by examining the
state of these read-only bits, which are loaded from NVM at reset. The function of the
bits is defined in the device's Chip Configuration details.
All bits in the register are read-only.
During the reset sequence, the register is loaded from the flash nonvolatile option 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 + 3h offset = 4002_0003h
Bit
7
6
5
4
3
2
1
0
Read
Write
Reset
* Notes:
x = Undefined at reset.
•
Memory map and registers
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
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NXP Semiconductors
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