MRF24J40 Datasheet, PDF (28/66 Pages) Microchip Technology – IEEE 802.15.4™ 2.4 GHz RF Transceiver

MRF24J40
6.4.3 LONG ADDRESSES
Every device in the world has a unique long address.
Long addresses are described in more detail in
Section 5.2.5 “Destination Address Information”
and Section 5.2.6 “Source Address Information”.
EADR0-EADR7 are eight short RAM address registers
in the MRF24J40 that are used to define the device’s
long address. These addresses should be loaded into
the device during the device configuration. The
MRF24J40 will automatically filter out any long address
packets that do not match the contents of
EADR0-EADR7.
6.4.4 SHORT ADDRESS AND PAN ID
The device’s short address and PAN ID are programmed
into the MRF24J40 through the SADRL, SADRH,
PANIDL and PANIDH registers. These registers are
located in the short RAM address space. The
MRF24J40 automatically filters out packets that are
specified as short address destinations with addresses
that do not match these registers. The exception to this
rule is packets with the broadcast short address (FFFFh)
and/or the broadcast PAN ID (FFFFh). Packets that
match the short address and have the broadcast PAN ID
will be accepted, as well as packets with the broadcast
short address that match the PAN ID. A true broadcast
packet will have both the short address and PAN ID set
to the broadcast address. The MRF24J40 will also
receive these packets no matter what the setting of the
short address and PAN ID registers.
Example 6-1 shows how to initialize the MRF24J40.
REGISTER 6-11: PANIDL: MAC PAN LOW BYTE REGISTER
R/W-0
bit 7
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
MAC PAN Low Byte (PANL<7:0>)
R/W-0
R/W-0
bit 0
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
bit 7-0
PANL7:PANL0: Lower Byte of PAN Address bits
REGISTER 6-12: PANIDH: MAC PAN HIGH BYTE REGISTER
R/W-0
bit 7
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
MAC PAN High Byte (PANH<15:8>)
R/W-0
R/W-0
bit 0
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
bit 7-0
PANH15:PANH8: Higher Byte of PAN Address bits
DS39776A-page 26
Advance Information
© 2006 Microchip Technology Inc.