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| 型號(hào)： | 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(yè)數(shù)： | 193/198頁(yè) |
| 文件大?。?/td> | 4822K |
| 代理商： | MQ80C32E-30/883 |
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94
8111C–MCU Wireless–09/09
AT86RF231
8.5
Clear Channel Assessment (CCA)
The main features of the Clear Channel Assessment (CCA) module are:
All 4 modes are available as defined by IEEE 802.15.4-2006 in section 6.9.9
Adjustable threshold for energy detection algorithm
8.5.1
Overview
A CCA measurement is used to detect a clear channel. Four modes are specified by
IEEE 802.15.4 - 2006:
8.5.2
Configuration and Request
The CCA modes are configurable via register 0x08 (PHY_CC_CCA).
Using the Basic Operating Mode, a CCA request can be initiated manually by setting
CCA_REQUEST = 1 (register 0x08, PHY_CC_CCA), if the AT86RF231 is in any RX state. The
current channel status (CCA_STATUS) and the CCA completion status (CCA_DONE) are
accessible in register 0x01 (TRX_STATUS).
The CCA evaluation is done over eight symbol periods and the result is accessible
t
TR28 = 140 s (128 s measurement duration and processing delay) after the request. The end
of a manually initiated CCA measurement is indicated by an interrupt IRQ_4 (CCA_ED_DONE).
The sub-register CCA_ED_THRES of register 0x09 (CCA_THRES) defines the received power
threshold of the "Energy above threshold" algorithm. The threshold is calculated by
RSSI_BASE_VAL + 2 * CCA_ED_THRES [dBm]. Any received power above this level is inter-
preted as a busy channel.
Note, it is not recommended to manually initiate a CCA measurement when using the Extended
Operating Mode.
Table 8-8.
CCA Mode Overview
CCA Mode
Description
1
Energy above threshold.
CCA shall report a busy medium upon detecting any energy above the ED threshold.
2
Carrier sense only.
CCA shall report a busy medium only upon the detection of a signal with the modulation
and spreading characteristics of an IEEE 802.15.4 compliant signal. The signal strength
may be above or below the ED threshold.
0, 3
Carrier sense with energy above threshold.
CCA shall report a busy medium using a logical combination of
– Detection of a signal with the modulation and spreading
characteristics of this standard and
– Energy above the ED threshold.
Where the logical operator may be configured as either OR (mode 0) or AND (mode 3).
相關(guān)PDF資料 |
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| MR80C52CXXX-16/883R | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, CQCC44 |
| MR80C52TXXX-16SB | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, CQCC44 |
| MD83C154TXXX-L16P883D | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, CDIP40 |
| MD83C154XXX-L16P883D | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, CDIP40 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| MQ82370-20 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MQ8238020 | 制造商:Intel 功能描述:CONTROLLER: OTHER |
| MQ82380-20 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MQ82380-20/R | 制造商:Rochester Electronics LLC 功能描述: |
| MQ82592 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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