MRF24XA_15 Datasheet, PDF (54/258 Pages) Microchip Technology – Low-Power, 2.4 GHz ISM-Band IEEE 802.15.4™ RF

MRF24XA
REGISTER 2-38:
R-00
r
bit 7
EDCON (ENERGY DETECT CONTROL REGISTER)⁽¹⁾⁾
R/W-0
R/W/HC-0
R/W-1110
EDMODE
EDST
EDLEN<3:0>
ADDRESS: 0x31
bit 0
Legend: R = Readable bit W = Writable bit
-n = Value at POR
‘1’ = Bit is set
r = Reserved
HC = Hardware Clear
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
bit 7-6
bit 5
bit 4
bit 3-0
Reserved: Maintain as ‘0’
EDMODE: Energy Detect Mode Select bit
1 = Energy Detect Sampling Mode. ED duration is 128 µs. A single atomic RSSI-peak measurement
is accomplished. The result is stored in EDPEAK<7:0> register.
0 = Energy Detect Scan Mode. EDLEN<3:0> sets the ED duration. The result is stored in
EDMEAN<7:0> register.
EDST: Energy Detect Measurement Start bit
Setting this register bit trigers MCU to start a new ED measurement. The hardware clears this bit when
the ED measurement is done (EDCCAIF is unchanged) and values in EDMEAN<7:0> and
EDPEAK<7:0> are valid.
If the ED measurement is aborted (RX state changes, or the MCU clears the EDST bit), then EDCCAIF
is unchanged.
EDLEN<3:0>: Energy Detect Measurement Length Field bits⁽²⁾
Value M indicates a sequence of (M + 1) * 8 atomic RSSI-peak measurements, each having the duration
of 128 µs. At the end of the aggregate measurement, the mean and the peak value of the sequence are
available in EDMEAN<7:0> and EDPEAK<7:0>.
Note 1:
2:
The RX chain must be turned on (RXEN = 1) to perform this measurement. Packet reception is disabled
during the measurement.
When EDLEN<3:0> = M = 0xE, the 128 μs atomic measurements are preformed 120 times, which is equal
to the a BaseSuperFrameDuration parameter in the IEEE 802.15.4 standard.
REGISTER 2-39:
bit 7
EDMEAN (ENERGY DETECT MEAN INDICATION REGISTER)
R/HS/HC-00000000
EDMEAN<7:0>
ADDRESS: 0x32
bit 0
Legend: R = Readable bit W = Writable bit
-n = Value at POR
‘1’ = Bit is set
r = Reserved
HC = Hardware Clear
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
HS = Hardware Set
bit 7-0
EDMEAN<7:0>: Energy Detect Mean Indication Field bits
Measured mean signal strength during ED/CCA measurement.
DS70005023C-page 54
Preliminary
 2015 Microchip Technology Inc.