The Persistent Latch Read mode of the INFO
command allows for
reading the state of the persistent latch. This is useful to verify the state of the
persistent latch when a key authorization has been connected to that latch.
For the ATECC608A-TFLXTLS device this command is only valid when the Secure Boot option is enabled. When this option has been enabled the command will read back a “1” if the SecureBoot operation has completed successfully otherwise a “0”. This status also indicates the ECC Primary Key (Slot 0) has been authorized or not.
Opcode |
Mode |
Param |
Data |
Description |
---|---|---|---|---|
0x30 |
0x04 |
0x00 00 |
— | Read back the value of the persistent latch. |
Name | Response | Description |
---|---|---|
Response | 0x00 00 00 00 |
Successful return value if persistent latch is disabled or if value to persistent latch has been written successfully. |
0x00 00 00 01 |
Successful return value if persistent latch is enabled | |
0xXX |
Single byte error code upon failure |