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參數(shù)資料
| 型號： | MQ80C52CXXX-20/883R |
| 廠商： | ATMEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 20 MHz, MICROCONTROLLER, CQFP44 |
| 封裝： | CERAMIC, QFP-44 |
| 文件頁數(shù)： | 65/101頁 |
| 文件大?。?/td> | 3398K |
| 代理商： | MQ80C52CXXX-20/883R |
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89
8168C-MCU Wireless-02/10
AT86RF212
LBT Threshold
According to [5], the maximum LBT threshold for an IEEE 802.15.4 signal is
presumably -82 dBm, assuming a channel spacing of 1 MHz.
6.7.2 LBT Mode
The AT86RF212 supports the previously described LBT specific listening mode when
operating in the Extended Operating Mode.
In particular, during TX_ARET (see section 5.2.4), the CSMA-CA algorithm can be
replaced by the LBT listening mode when setting register bit CSMA_LBT_MODE
(register
0x17,
XAH_CTRL_1).
In
this
case,
however,
the
register
bits
MAX_CSMA_RETRIES (register 0x2C, XAH_CTRL_0) as well as MIN_BE and
MAX_BE (register 0x2F, CSMA_BE) are ignored, implying that the listening mode will
sustain unless a clear channel has been found or the TX_ARET transaction will be
canceled. The latter can be achieved by setting TRX_CMD to either FORCE_PLL_ON
or FORCE_TRX_OFF (register 0x02, TRX_STATE). All other aspects of TX_ARET
remain unchanged, refer to section 5.2.4.
The LBT threshold can be configured in the same way as for CCA, i.e. via register bits
CCA_MODE (register 0x08, PHY_CC_CCA) and register bits CCA_ED_THRES
(register 0x09, CCA_THRES), refer to section 6.6.
6.7.3 Register Description
Register 0x08 (PHY_CC_CCA):
This register is relevant for the measurement mode when using LBT, i.e. selecting
“energy above threshold” or “carrier sense” (CS) or combination of both.
Table 6-36. Register 0x08 (PHY_CC_CCA)
Bit
7
6
5
4
Name
CCA_REQUEST
CCA_MODE[1]
CCA_MODE[0]
CHANNEL[4]
Read/Write
W
R/W
Reset Value
0
1
0
Bit
3
2
1
0
Name
CHANNEL[3]
CHANNEL[2]
CHANNEL[1]
CHANNEL[0]
Read/Write
R/W
Reset Value
0
1
0
1
Bit 7 – CCA_REQUEST
Not applicable for LBT, see section 6.6.6.
Bit 6:5 – CCA_MODE
The CCA mode can be used in order to select the appropriate LBT measurement mode
by using register bits CCA_MODE, refer to section 6.6.
Bit 4:0 – CHANNEL
Refer to section 7.8.6.
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