14.8.9 CCA_THRES
| Name: | CCA_THRES |
| Offset: | 0x09 |
| Reset: | 0x77 |
| Property: | - |
| Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
| CCA_CS_THRES[3:0] | |||||||||
| Access | R/W | R/W | R/W | R/W | |||||
| Reset | 0 | 1 | 1 | 1 | |||||
Bits 3:0 – CCA_CS_THRES[3:0] CCA_CS_THRES
The register bits CCA_CS_THRES are used for CCA carrier sense algorithm.
| Value | Description |
|---|---|
| 0x07 | Default value. |
| 0x0F | A threshold of 15 always signals an empty channel |
| All other values are reserved |
- A value of seven (reset value) corresponds to normal CCA_CS operation. A value of 15 results in always sensing an empty channel if CCA_MODE = 2 (carrier sense only). This can be useful in combination with TX_ARET, that is allowing retries with actually performing CSMA-CA.
Bits 3:0 – CCA_ED_THRES[3:0] CCA_ED_THRES
An ED value above the threshold signals the channel as busy during a CCA_ED measurement.
| Value | Description |
|---|---|
| 0x07 | For CCA_MODE = 1, a busy channel is indicated if the measured received power is above P_THRES[dBm] = RSSI_BASE_VAL[dBm] + 2[dB] x CCA_ED_THRES. CCA modes 0 and 3 are logically related to this result. |
- If CSMA_LBT_MODE is enabled, CCA_ED_THRES is used for the LBT measurement.