
111
8266A-MCU Wireless-12/09
These bits define the received power threshold of the Energy above threshold
algorithm. The threshold is calculated by RSSI_BASE_VAL + 2CCA_ED_THRES
[dBm]. Any received power above this level is interpreted as a busy channel.
9.12.14 RX_CTRL – Transceiver Receive Control Register
Bit 7 6 5 4
NA ($14A) Resx7 Resx6 Resx5 Resx4 RX_CTRL
Read/Write RW RW RW RW
Initial Value 1 0 1 1
Bit 3 2 1 0
NA ($14A) PDT_THRES3 PDT_THRES2 PDT_THRES1 PDT_THRES0 RX_CTRL
Read/Write RW RW RW RW
Initial Value 0 1 1 1
The register controls the sensitivity of the Antenna Diversity Mode. Note that in High
Data Rate modes the ACR module will always be disabled.
• Bit 7:4 – Resx7:4 - Reserved
• Bit 3:0 – PDT_THRES3:0 - Receiver Sensitivity Control
These register bits control the sensitivity of the receiver correlation unit. If the Antenna
Diversity algorithm is enabled the value shall be set to PDT_THRES = 3. Otherwise it
shall be set back to the reset value. Values not listed in the following table are reserved.
Table 9-44 PDT_THRES Register Bits
Register Bits Value Description
0x7 Reset value, to be used if Antenna Diversity
algorithm is disabled
PDT_THRES3:0
0x3 Recommended correlator threshold for
Antenna Diversity operation
9.12.15 SFD_VALUE – Start of Frame Delimiter Value Register
Bit 7 6 5 4 3 2 1 0
NA ($14B) SFD_VALUE7:0 SFD_VALUE
Read/Write RW RW RW RW RW RW RW RW
Initial Value 1 0 1 0 0 1 1 1
This register contains the one octet start-of-frame delimiter (SFD) to synchronize to a
received frame. The lower 4 bits must not be all zero to avoid decoding conflicts.
• Bit 7:0 – SFD_VALUE7:0 - Start of Frame Delimiter Value
For compliant IEEE 802.15.4 networks set SFD_VALUE = 0xA7. This is the default
value of the register. To establish non IEEE 802.15.4 compliant networks the SFD value
can be changed to any other value. If enabled a RX_START interrupt is issued only if
the received SFD matches the register content of SFD_VALUE and a valid PHR is
received.
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