AT86RF232 Atmel Corporation, AT86RF232 Datasheet - Page 133

• Manufacturer Part Number: AT86RF232
• Manufacturer: Atmel Corporation

Specifications of AT86RF232

• Max. Operating Frequency: 0 MHz
• Crypto Engine: AES
• Operating Voltage (vcc): 1.8 to 3.6
• Frequency Band: 2.4 GHz
• Max Data Rate (mb/s): 0.25
• Antenna Diversity: Yes
• External Pa Control: Yes
• Power Output (dbm): 3
• Receiver Sensitivity (dbm): -100
• Receive Current Consumption (ma): 11.8
• Transmit Current Consumption (ma): 13.8
• Link Budget (dbm): 103

11.2 Random Number Generator
11.2.1 Overview
11.2.2 Register Description
8321A–MCU Wireless–10/11
Bit
0x06
Read/Write
Reset value
Bit
0x06
Read/Write
Reset value
The Atmel AT86RF232 incorporates a two bit truly random number generator by
observation of noise. This random number can be used to:
 Generate random seeds for CSMA-CA algorithm
 Generate random values for AES key generation
The random number is updated every t
states. The values are stored in register bits RND_VALUE (register 0x06, PHY_RSSI).
Register 0x06 (PHY_RSSI):
The PHY_RSSI register is a multi-purpose register that indicates FCS validity, provides
random numbers and shows the actual RSSI value.
Figure 11-8. Register PHY_RSSI.
 Bit 6:5 - RND_VALUE
The 2-bit random value can be retrieved by reading register bits RND_VALUE.
Table 11-8. RND_VALUE.
Register Bits
RND_VALUE
Note:
1.
RX_CRC_VALID
The radio transceiver shall be in Basic Operating Mode receive state.
R
R
7
0
3
0
Value
3
R
R
6
1
2
0
Description
Deliver two bit noise value within receive state.
Valid values are [3, 2, …, 0].
RND_VALUE
RSSI
RND
= 1µs in Basic Operation Mode receive
R
R
5
1
1
0
see
see
Section 7.2
Section 11.1
RSSI
R
R
4
0
0
0
AT86RF232
PHY_RSSI
PHY_RSSI
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