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AT86RF232
Table 8-11. C CA Measurement Period and Access i n BUSY_RX state.
CCA Mode
1
Request within ED measurement
Energy above threshold .
(1)
Request after ED measurement
CCA result is available after finishing
automated ED measurement period.
CCA result is immediately available
after request.
2
3
Carrier sense only .
CCA result is immediately available after request.
Carrier sense with Energy above threshol d (AND) .
CCA result is available after finishing
automated ED measurement period.
CCA result is immediately available
after request.
0
Carrier sense with Energy above threshol d (OR) .
CCA result is available after finishing
automated ED measurement period.
CCA result is immediately available
after request.
Note:
1. After receiving the SHR an automated ED measurement is started with a length of
eight symbol periods (PSDU rate 250kb/s), refer to Section 8.4 . This automated
ED measurement must be finished to provide a result for the CCA measurement.
Only one automated ED measurement per frame is performed.
In BUSY_RX state the CCA measurement duration depends on the CCA Mode and the
CCA request relative to the reception of an SHR. The end of the CCA measurement is
indicated by an IRQ_4 (CCA_ED_DONE). The variation of a CCA measurement period
in BUSY_RX state is described in Table 8-11 .
It is recommended to perform CCA measurements in Atmel AT86RF232 RX_ON state
only. To avoid switching accidentally to BUSY_RX state the SHR detection can be
disabled by setting register bit RX_PDT_DIS (register 0x15, RX_SYN), refer to
Section 9.1 . The receiver remains in RX_ON state to perform a CCA measurement until
the register bit RX_PDT_DIS is set back to continue the frame reception. In this case
the CCA measurement duration is eight symbol periods.
8.5.6 Register Description
Register 0x01 (TRX_STATUS):
The read-only register TRX_STATUS signals the present state of the radio transceiver
as well as the status of a CCA operation.
Figure 8-10 . Register TRX_STATUS.
Bit
7
6
5
4
0x01
Read/Write
Reset value
Bit
CCA_DONE
R
0
3
CCA_STATUS
R
0
2
reserved
R
0
1
TRX_STATUS
R
0
0
TRX_STATUS
0x01
TRX_STATUS
TRX_STATUS
Read/Write
Reset value
R
0
R
0
R
0
R
0
95
8321A – MCU Wireless – 10/11
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