Linx HumPRC Series Data Manual page 38

CMD - Command Register
Volatile Address = 0xC7
This volatile write-only register is used to issue special commands.
HumPRC Series Command Register
TM
Write Command
Header Size Escape Address
0xFF Size 0xFE 0x47
Figure 69: HumPRC TM Series Transceiver Command Register Command and Response
Value V is chosen from among the options in Figure 70.
HumPRC Series CMD Values
TM
CMD Value Operation
0x10 JOINCTL – Join Process Control
0x11 WRKEY – Write Key
0x12 CLRKEY – Clear Key
0x13 RLDKEY – Reload Key
0x20 0xAA 0xBB NVRESET – Reset non-volatile registers to factory default
Figure 70: HumPRC Series Command Register Values
TM
The Join Process Control command allows the software to initiate or stop
the secure Join Process. It has the following subcommands.
HumPRC Series JOINCTL Subcommand Values
TM
Subcommand Value Operation
0 Halt Join Process
Generate a random network key and address. This sets the
1
module as the network administrator (SECOPT:KEYRCV=0)
2 Perform the Join Process with another module
Figure 71: HumPRC Series JOINCTL Subcommand Values
TM
These operations are equivalent to the push-button initiated operation.
If the Join Process is started by the serial command (CMD:JOINCTL[2]),
push-button operation is ignored until the Join Process finishes.
Register write operations are inhibited when the Join Process is active
except that a Halt Join command is never inhibited. A Halt Join operation
completes before the ACK is sent.
Value
V
– –
70
When the Join Process is started the KEYRCV flag in the
determines whether the module is an administrator or node and whether
a key can be sent or changed. The Join Process uses and modifies
the non-volatile address registers. After a successful Join, the modified
non-volatile registers are copied to the corresponding volatile registers.
The Write Key command writes a 16-byte AES key to the selected key
register. As with most of the registers, the encryption key has both volatile
and non-volatile registers. The volatile register is used during run time, but
is lost on a power cycle or reset. When the module powers up, the volatile
register is loaded from the non-volatile register. This makes the non-volatile
register value the default on power-up.
The key value of all zero bytes is reserved as a "no key" indication.
Figure 72 shows the command for writing the AES key to the module.
HumPRC TM Series Write Key Command
Write Command
Header Size Escape Address
0xFF Size 0xFE 0x47
Figure 72: HumPRC Series Transceiver Write Key Command
TM
If KeyN is 0x01, the command writes to the volatile key register. If it is 0x02,
it writes to the non-volatile key register.
The Clear Key command sets the selected key to all zeros. Figure 73
shows the structure of this command.
HumPRC TM Series Clear Key Command
Write Command
Header Size Escape Address
0xFF 0x04 0xFE 0x47
Figure 73: HumPRC Series Transceiver Clear Key Command
TM
If KeyN is 0x01, the command clears the volatile key registers. If it is 0x02,
it clears the non-volatile key registers.
SECOPT register
Value KeyN Key0 ... Key15
0x11 KeyN Key0 ... Key15
Value KeyN
0x12 KeyN
– –
71