Rainbow Electronics ATmega128RFA1 - Manual (Page 107)

107
8266A-MCU Wireless-12/09
ATmega128RFA1
Table 9-37 PA_LT Register Bits
Register Bits Value Description
0 2 µs
1 4 µs
2 6 µs
PA_LT1:0
3 8 µs
• Bit 3:0 – TX_PWR3:0 - Transmit Power Setting
These register bits determine the TX output power of the radio transceiver.
Table 9-38 TX_PWR Register Bits
Register Bits Value Description
0 3.0 dBm
1 2.8 dBm
2 2.3 dBm
3 1.8 dBm
4 1.3 dBm
5 0.7 dBm
6 0.0 dBm
7 -1 dBm
8 -2 dBm
9 -3 dBm
10 -4 dBm
11 -5 dBm
12 -7 dBm
13 -9 dBm
14 -12 dBm
TX_PWR3:0
15 -17 dBm
9.12.10 PHY_RSSI – Receiver Signal Strength Indicator Register
Bit 7 6 5 4
NA ($146) RX_CRC_VALID RND_VALUE1 RND_VALUE0 RSSI4 PHY_RSSI
Read/Write R R R R
Initial Value 0 0 0 0
Bit 3 2 1 0
NA ($146) RSSI3 RSSI2 RSSI1 RSSI0 PHY_RSSI
Read/Write R R R R
Initial Value 0 0 0 0
The PHY_RSSI register is a multi purpose register that indicates FCS validity, provides
random numbers and shows the current RSSI value.
• Bit 7 – RX_CRC_VALID - Received Frame CRC Status
Reading this register bit indicates whether the last received frame has a valid FCS or
not. The register bit is updated when issuing a TRX24_RX_END interrupt and remains