NXP Semiconductors Kinetis KE1xZ256, Reference Manual

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Table 22-45. Parameters (continued)
Parameters Description
State Pointer to the value returned for the current security status code:
Table 22-46. Returned value
kFLASH_SecurityStateNotSecure 0 Flash is under unsecured mode.
kFLASH_SecurityStateBackdoorEnabled 1 Flash is under secured mode and
Backdoor is enabled.
kFLASH_SecurityStateBackdoorDisabled 2 Flash is under secured mode and
Backdoor is disabled.
Table 22-47. Possible status response
Value Constant Description
4 kStatus_InvalidArgument Config or state pointers are NULL.
0 kStatus_Success This function has performed successfully.
Example:
flash_security_state_t state;
status_t status = FLASH_GetSecurityState (&flashInstance, &state);
22.4.5.7 FLASH_SecurityBypass
Allows the user to bypass security with a backdoor key. If the MCU is in a secured state,
then the FLASH_SecurityBypass function unsecures the MCU, by comparing the
provided backdoor key with keys in the Flash Configuration Field.
Prototype:
status_t FLASH_SecurityBypass(flash_config_t *config, const uint8_t *backdoorKey);
Table 22-48. Parameters
Parameter Description
Config Pointer to
flash_config_t
data structure in memory, to
store driver runtime state.
backdoorKey Pointer to the user buffer containing the backdoor key.
Chapter 22 Kinetis ROM Bootloader
Kinetis KE1xZ256 Sub-Family Reference Manual, Rev. 3, 07/2018
NXP Semiconductors 509