ATmega1284PR231 Atmel Corporation, ATmega1284PR231 Datasheet - Page 136
ATmega1284PR231
Manufacturer Part Number
ATmega1284PR231
Description
Manufacturer
Atmel Corporation
Datasheets
1.AT86RF231.pdf
(198 pages)
2.ATMEGA1284PR231.pdf
(380 pages)
3.ATMEGA1284PR231.pdf
(20 pages)
Specifications of ATmega1284PR231
Flash (kbytes)
128 Kbytes
Max. Operating Frequency
20 MHz
Max I/o Pins
32
Spi
3
Twi (i2c)
1
Uart
2
Adc Channels
8
Adc Resolution (bits)
10
Adc Speed (ksps)
15
Analog Comparators
1
Crypto Engine
AES
Sram (kbytes)
16
Eeprom (bytes)
4096
Operating Voltage (vcc)
1.8 to 3.6
Timers
3
Frequency Band
2.4 GHz
Max Data Rate (mb/s)
2
Antenna Diversity
Yes
External Pa Control
Yes
Power Output (dbm)
3
Receiver Sensitivity (dbm)
-101
Receive Current Consumption (ma)
13.2
Transmit Current Consumption (ma)
14.4
Link Budget (dbm)
104
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11.2
11.2.1
11.2.2
8111C–MCU Wireless–09/09
Random Number Generator
Overview
Register Description
The AT86RF231 incorporates a 2-bit truly random number generator by observation of noise.
This random number can be used to:
The random number is updated every t
values are stored in register bits RND_VALUE (register 0x06, PHY_RSSI).
Register 0x06 (PHY_RSSI):
Register 0x06 (PHY_RSSI) is a multi purpose register to indicate FCS validity, to provide ran-
dom numbers and an RSSI value.
• Bit 7 - RX_CRC_VALID
Refer to register description in
• Bit [6:5] - RND_VALUE
The 2-bit random value can be retrieved by reading register bits RND_VALUE. Note that the
radio transceiver shall be in Basic Operating Mode receive state. The values are updated each
t
• Bit [4:0] - RSSI
Refer to register description in
Note:
TR29
Bit
+0x06
Read/Write
Reset Value
• Generate random seeds for CSMA-CA algorithm
• Generate random values for AES key generation
= 1 µs.
Ensure that register bit RX_PDT_DIS (register 0x15, RX_SYN) is set to 0 at least 1 µs before
reading a random value.
RX_CRC_VALID
7
R
0
6
R
0
Section 8.2.5 “Register Description” on page
Section 8.3.4 “Register Description” on page
RND_VALUE
5
R
0
TR29
= 1 µs in Basic Operation Mode receive states. The
4
R
0
3
R
0
RSSI
2
R
0
see
see
Section 7.2
Section 11.1
1
R
0
AT86RF231
87.
90.
0
R
0
PHY_RSSI
136
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