No
. 96-1886-01E
Rev
.
1.1
GTECH Aircon Radio (Model GWT154)
PAGE
24
OF
72
4.4
Non
Volatile
Settings
Both the Coordinator and End Device radios must retain the PAN, EUI-64, Short Address, encryption
key, etc., after a successful joining sequence. In addition, certain system configuration parameters like
BAUD rate, transmit power, etc. may also be saved in non-volatile memory.
The CC2530 may reserve sectors in its on-chip Flash memory to store non-volatile data. Once a
CC2530 has been factory programmed with the executable code binary image, factory default key,
EUI-64 and PIN, a Debug Lock bit is permanently set in Flash that prevents further access to the Flash
memory image via the In-System-Programming (ISP) interface. Only the CHIP_ERASE command
may be executed by the ISP after a CC2530 has been Debug Locked, allowing only the full erasure of
the embedded Flash memory.
It is important to note that after network commissioning; only the radios know the randomly generated
network key. The Host CPU only knows of the End Devices by their Short Address and EUI-64. In
addition, no ability to access the network key value stored in the radio’s non-volatile memory will be
provided by the Host CPU’s serial interface protocol. The Host CPU will have no knowledge, nor
access to, a radio network’s unique encryption key.