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參數(shù)資料
| 型號： | MQ80C154-20P883 |
| 廠商： | ATMEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, 20 MHz, MICROCONTROLLER, CQFP44 |
| 封裝： | CERAMIC, QFP-44 |
| 文件頁數(shù)： | 60/101頁 |
| 文件大?。?/td> | 3398K |
| 代理商： | MQ80C154-20P883 |
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84
8168C-MCU Wireless-02/10
AT86RF212
Table 6-27. Register 0x07 (PHY_ED_LEVEL)
Bit
7
6
5
4
3
2
1
0
Name
ED_LEVEL[7:0]
Read/Write
R
(1)
Reset Value
1
Note:
1. A write access is required for initiation of a manual ED measurement.
Bit 7:0 – ED_LEVEL
The measured ED value has a valid range from 0x00 to 0x54 (0 to 84). The value 0xFF
indicates that a measurement has never been started (reset value).
A manual ED measurement can be initiated by a write access to the register.
6.6 Clear Channel Assessment (CCA)
The main features of the Clear Channel Assessment (CCA) module are:
All four CCA modes are provided as defined in IEEE 802.15.4-2006
Adjustable threshold for energy detection algorithm
6.6.1 Overview
A CCA measurement is used to detect a clear channel. Four CCA modes are specified
by IEEE 802.15.4-2006:
Table 6-28. 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/or
-
energy above the ED threshold,
where the logical operator may be configured as either OR (mode 0) or AND
(mode 3).
6.6.2 Configuration and Request
The CCA modes are configurable via register 0x08 (PHY_CC_CCA).
When being in Basic Operating Mode, a CCA request can be initiated manually by
setting CCA_REQUEST = 1 (register 0x08, PHY_CC_CCA) if the AT86RF212 is in any
RX state. The current channel status (CCA_STATUS) and the CCA completion status
(CCA_DONE) are accessible through register 0x01 (TRX_STATUS).
The end of a manually initiated CCA (8 symbol periods plus 12 s processing delay) is
indicated by the interrupt IRQ_4 (CCA_ED_DONE).
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