LMX9830SM National Semiconductor, LMX9830SM Datasheet - Page 17

• Manufacturer Part Number: LMX9830SM
• Manufacturer: National Semiconductor

Specifications of LMX9830SM

• Lead Free Status / Rohs Status: Not Compliant

9.7 USING AN EXTERNAL EEPROM FOR NON-VOLATILE
DATA
The LMX9830 offers two interfaces to connect to external
memory. Depending on the EEPROM used, the interface is
activated by setting the correct option pins during start up.
See Table 16 for the option pin settings.
The external memory is used to store mandatory parameters
like the BD_Address as well as many optional parameters like
Link Keys or even User data.
The NVM is organized with fixed addresses for the parame-
ters. Because of that the EEPROM can be preprogrammed
with default parameters in manufacturing. Refer to "Operation
17
Parameters Stored in LMX9830" for the organization of the
NVS map.
In case the external memory is empty on first startup the
LMX9830 will behave as like no memory is connected. (See
Section 9.6.3 Startup Without External PROM Available).
During the startup process parameters can be written directly
to the EEPROM to be available after next bootup. On first
bootup, the EEPROM will be automatically programmed to
default values, including the UART speed of 9600 BPS.
Patches supplied over the TL will be stored automatically into
the EEPROM.
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