參數(shù)資料
型號(hào)： IF180C52EXXX-L16:R
廠商： TEMIC SEMICONDUCTORS
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP44
文件頁(yè)數(shù)： 65/101頁(yè)
文件大?。?/td> 3398K
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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IF180C52T-20 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller
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