
131
42073A-MCU Wireless-02/13
ATmega2564/1284/644RFR2
This register controls the sensitivity threshold of the receiver.
Bit 7 – RX_PDT_DIS - Prevent Frame Reception
RX_PDT_DIS = 1 prevents the reception of a frame even if the radio transceiver is in
receive modes. An ongoing frame reception is not affected. This operation mode is
independent of the setting of register bits RX_PDT_LEVEL.
Bit 6 – RX_OVERRIDE - Receiver Override Function
If this bit is set, the receiver restarts the reception if a co-channel interferer is detected.
This function is not directly visible, but should lead to a better co-channel interference
suppression.
Bit 5 – RXO_CFG1 - RX_OVERRIDE Configuration
Configures the different RX_OVERRIDE options.
Bit 4 – RXO_CFG0 - RX_OVERRIDE configuration
Configures the different RX_OVERRIDE options.
Bit 3:0 – RX_PDT_LEVEL3:0 - Reduce Receiver Sensitivity
These register bits reduce the receiver sensitivity such that frames with a RSSI level
below the RX_PDT_LEVEL threshold level are not received (RX_PDT_LEVEL>0). The
threshold level can be calculated according to the following formula: RX_THRES >
RSSI_BASE_VAL+3(RX_PDT_LEVEL-1), for RX_PDT_LEVEL>0. If register bits
RX_PDT_LEVEL>0 the current consumption of the receiver in states RX_ON and
RX_AACK_ON is reduced by 500 A. If register bits RX_PDT_LEVEL=0 (reset value)
all frames with a valid SHR and PHR are received, independently of their signal
strength. Examples for certain register settings are given in the following table.
Table 9-67 RX_PDT_LEVEL Register Bits
Register Bits
Value
Description
RX_PDT_LEVEL3:0
0x0
RX_THRES ≤ RSSI_BASE_VAL (Reset
value); RSSI value not considered
0x1
RX_THRES > RSSI_BASE_VAL + 0 3;
RSSI > -90 dBm
0x2
...
0xE
RX_THRES > RSSI_BASE_VAL + 13 3;
RSSI > -51 dBm
0xF
RX_THRES > RSSI_BASE_VAL + 14 3;
RSSI > -48 dBm
9.12.27 XAH_CTRL_1 – Transceiver Acknowledgment Frame Control Register 1
Bit
7
6
5
4
NA ($157)
Res1
Res0
AACK_FLTR_RES_FT AACK_UPLD_RES_FT
XAH_CTRL_1
Read/Write
R
RW
Initial Value
0
Bit
3
2
1
0
NA ($157)
Res
AACK_ACK_TIME AACK_PROM_MODE
Res
XAH_CTRL_1
Read/Write
R
RW
R
Initial Value
0