ATmega644R212 Atmel Corporation, ATmega644R212 Datasheet - Page 64
ATmega644R212
Manufacturer Part Number
ATmega644R212
Description
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
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7.2.4
8111C–MCU Wireless–09/09
TX_ARET_ON - Transmit with Automatic Retry and CSMA-CA Retry
Figure 7-12. Flow Diagram of TX_ARET
(see Note 1)
N
TRX_STATE = BUSY_TX_ARET
N
N
TRX_STATE = TX_ARET_ON
TRAC_STATUS = INVALID
frame_rctr = frame_rctr + 1
csma_rctr = csma_rctr + 1
MAX_FRAME_RETRIES
MAX_CSMA_RETRIES
TRAC_STATUS =
Random Back-Off
Transmit Frame
ACK requested
frame_rctr = 0
csma_rctr = 0
Receive ACK
until timeout
frame_rctr >
ACK valid
NO_ACK
Start TX
Result
CCA
CCA
<7
Success
Y
Y
Y
Y
N
Y
Failure
N
N
Y
SUCCESS_DATA_PENDING
Note 1: If MAX_CSMA_RETRIES = 7 no retry is
TRAC_STATUS =
Data Pending
performed
Issue IRQ_3 (TRX_END) interrupt
MAX_CSMA_RETRIES
TRX_STATE = TX_ARET_ON
Y
csma_rctr >
N
N
TRAC_STATUS =
SUCCESS
Y
CHANNEL_ACCESS_FAILURE
AT86RF231
TRAC_STATUS =
64
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