ATmega1284PR231 Atmel Corporation, ATmega1284PR231 Datasheet - Page 98

• Manufacturer Part Number: ATmega1284PR231
• Manufacturer: Atmel Corporation

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

8111C–MCU Wireless–09/09
Bit
+0x09
Read/Write
Reset Value
R/W
7
1
CCA_STATUS (register 0x01, TRX_STATUS) are updated after a CCA_REQUEST. The regis-
ter bit is automatically cleared after requesting a CCA measurement with CCA_REQUEST = 1.
• Bit [6:5] - CCA_MODE
The CCA mode can be selected using register bits CCA_MODE.
Table 8-12.
Note that IEEE 802.15.4-2006 CCA Mode 3 defines the logical combination of CCA Mode 1 and
2 with the logical operators AND or OR. This can be selected with:
• Bit [4:0] - CHANNEL
Refer to
Register 0x09 (CCA_THRES):
This register sets the ED threshold level for CCA.
• Bit [7:5] - Reserved
• Bit [4:0] - CCA_ED_THRES
The CCA Mode 1 request indicates a busy channel if the measured received power is above
RSSI_BASE_VAL + 2 * CCA_ED_THRES [dBm]. CCA Modes 0 and 3 are logical related to this
result.
R/W
6
Register Bit
CCA_MODE
1
• CCA_MODE = 0
• CCA_MODE = 3
Reserved
Section 9.7 “Frequency Synthesizer (PLL)” on page
R/W
5
0
CCA Status Result
R/W
4
0
Value
0
1
2
3
State Description
Mode 3a, Carrier sense OR energy above threshold
Mode 1, Energy above threshold
Mode 2, Carrier sense only
Mode 3b, Carrier sense AND energy above threshold
R/W
3
0
for logical operation OR, and
for logical operation AND.
R/W
2
1
CCA_ED_THRES
121.
R/W
1
1
AT86RF231
R/W
0
1
CCA_THRES
98