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參數(shù)資料
| 型號： | MQ80C32E-30/883 |
| 廠商： | TEMIC SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, 30 MHz, MICROCONTROLLER, CQFP44 |
| 文件頁數(shù)： | 194/198頁 |
| 文件大?。?/td> | 4822K |
| 代理商： | MQ80C32E-30/883 |
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95
8111C–MCU Wireless–09/09
AT86RF231
8.5.3
Data Interpretation
The current channel status (CCA_STATUS) and the CCA completion status (CCA_DONE) are
accessible in register 0x01 (TRX_STATUS). Note, register bits CCA_DONE and CCA_STATUS
are cleared in response to a CCA_REQUEST.
The completion of a measurement cycle is indicated by CCA_DONE = 1. If the radio transceiver
detected no signal (idle channel) during the measurement cycle, the CCA_STATUS bit is set to
1.
Whe n usin g th e "en e r g y ab ove t h r e sh old " a l go r i t h m, an y re ceive d po we r ab o v e
CCA_ED_THRES level is interpreted as a busy channel. The "carrier sense" algorithm reports a
busy channel when detecting an IEEE 802.15.4 signal above the RSSI_BASE_VAL (see param-
eter 12.7.16). The radio transceiver is also able to detect signals below this value, but the
detection probability decreases with the signal power. It is almost zero at the radio transceivers
sensitivity level (see parameter 12.7.1).
8.5.4
Interrupt Handling
Interrupt IRQ_4 (CCA_ED_DONE) is issued at the end of a manually initiated CCA
measurement.
Notes
A CCA request should only be initiated in Basic Operating Mode receive states. Otherwise
the radio transceiver generates an IRQ_4 (CCA_ED_DONE) and sets the register bit
CCA_DONE = 1, even though no CCA measurement was performed.
Requesting a CCA measurement in BUSY_RX state and during an ED measurement, an
IRQ_4 (CCA_ED_DONE) could be issued immediately after the request. If in this case
register bit CCA_DONE = 0, an additional interrupt CCA_ED_DONE is issued after finishing
the CCA measurement and register bit CCA_DONE is set to 1.
8.5.5
Measurement Time
The response time for a manually initiated CCA measurement depends on the receiver state.
In RX_ON state the CCA measurement is done over eight symbol periods and the result is
accessible 140 s after the request (see above).
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 8-9 on page 95.
Table 8-9.
CCA Measurement Period and Access in BUSY_RX state
CCA Mode
Request within ED measurement(1)
Request after ED measurement
1
Energy above threshold.
CCA result is available after finishing
automated ED measurement period.
CCA result is immediately available after
request.
2
Carrier sense only.
CCA result is immediately available after request.
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