5 register description – Rainbow Electronics AT86RF231 User Manual
Page 93
93
8111A–AVR–05/08
AT86RF231
8.4.5
Register Description
Register 0x07 (PHY_ED_LEVEL):
The ED_LEVEL register contains the result of an ED measurement.
• Bit [7:0] - ED_LEVEL
The minimum ED value (ED_LEVEL = 0) indicates receiver power less than or equal to
RSSI_BASE_VAL. The range is 84 dB with a resolution of 1 dB and an absolute accuracy of
±5 dB. A manual ED measurement can be initiated by a write access to the register. A value
0xFF signals that a measurement has never been started yet (reset value).
The measurement duration is 8 symbol periods (128 µs) for a data rate of 250 kb/s.
For High Data Rate Modes the automated measurement duration is reduced to 32 µs, refer to
Section 11.3 “High Data Rate Modes” on page 137
. For manually initiated ED measurements in
these modes the measurement period is still 128 µs as long as the receiver is in RX_ON state.
A value other than 0xFF indicates the result of the last ED measurement.
Bit
7
6
5
4
3
2
1
0
+0x07
ED_LEVEL[7:0]
ED_LEVEL
Read/Write
R
R
R
R
R
R
R
R
Reset Value
1
1
1
1
1
1
1
1