ATmega644R212 Atmel Corporation, ATmega644R212 Datasheet - Page 63

• Manufacturer Part Number: ATmega644R212
• Manufacturer: Atmel Corporation

Specifications of ATmega644R212

• Flash (kbytes): 64 Kbytes
• Max. Operating Frequency: 20 MHz
• Max I/o Pins: 32
• Spi: 3
• Twi (i2c): 1
• Uart: 1
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Crypto Engine: AES
• Sram (kbytes): 4
• Eeprom (bytes): 2048
• Operating Voltage (vcc): 1.8 to 3.6
• Timers: 3
• Frequency Band: 700/800/900MHz
• Max Data Rate (mb/s): 1
• Antenna Diversity: No
• External Pa Control: Yes
• Power Output (dbm): 10
• Receiver Sensitivity (dbm): -110
• Receive Current Consumption (ma): 9.0
• Transmit Current Consumption (ma): 18 at 5dBm
• Link Budget (dbm): 120

Figure 7-11. Example Timing of an RX_AACK Transaction
8111C–MCU Wireless–09/09
Frame Type
TRX_STATE
RX/TX
IRQ
Typ. Processing Delay
RX_AACK_ON
0
If register bit AACK_ACK_TIME (register 0x17, XAH_CTRL_1) is set, an acknowledgment frame
is sent already 2 symbol times after the reception of the last symbol of a data or MAC command
frame.
64
SFD
RX
Data Frame (Length = 10, ACK=1)
t
IRQ
512
BUSY_RX_AACK
TRX_END
(12 symbols)
192 µs
704
ACK Frame
TX
AT86RF231
1088
RX_AACK_ON
RX
time [µs]
63