ATMEGA128RFA1-ZU Atmel, ATMEGA128RFA1-ZU Datasheet - Page 129

• Manufacturer Part Number: ATMEGA128RFA1-ZU
• Description: IC AVR MCU 2.4GHZ XCEIVER 64QFN
• Manufacturer: Atmel
• Series: ATMEGAr

Specifications of ATMEGA128RFA1-ZU

• Frequency: 2.4GHz
• Data Rate - Maximum: 2Mbps
• Modulation Or Protocol: 802.15.4 Zigbee
• Applications: General Purpose
• Power - Output: 3.5dBm
• Sensitivity: -100dBm
• Voltage - Supply: 1.8 V ~ 3.6 V
• Current - Receiving: 12.5mA
• Current - Transmitting: 14.5mA
• Data Interface: PCB, Surface Mount
• Memory Size: 128kB Flash, 4kB EEPROM, 16kB RAM
• Antenna Connector: PCB, Surface Mount
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-VFQFN, Exposed Pad
• Rf Ic Case Style: QFN
• No. Of Pins: 64
• Supply Voltage Range: 1.8V To 3.6V
• Operating Temperature Range: -40°C To +85°C
• Svhc: No SVHC (15-Dec-2010)
• Rohs Compliant: Yes
• Processor Series: ATMEGA128x
• Core: AVR8
• Data Bus Width: 8 bit
• Program Memory Type: Flash
• Program Memory Size: 128 KB
• Data Ram Size: 16 KB
• Interface Type: JTAG
• Maximum Clock Frequency: 16 MHz
• Number Of Programmable I/os: 38
• Number Of Timers: 6
• Operating Supply Voltage: 1.8 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVR128RFA1-EK1
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

8266B-MCU Wireless-03/11
• Bit 7:4 – MAX_FRAME_RETRIES3:0 - Maximum Number of Frame Re-
The setting of MAX_FRAME_RETRIES in TX_ARET mode specifies the number of
attempts to retransmit a frame when it was not acknowledged by the recipient. The
transaction gets canceled if the number of attempts exceeds MAX_FRAME_RETRIES.
Table 9-67 MAX_FRAME_RETRIES Register Bits
• Bit 3:1 – MAX_CSMA_RETRIES2:0 - Maximum Number of CSMA-CA Procedure
MAX_CSMA_RETRIES specifies the number of retries in TX_ARET mode to repeat the
CSMA-CA procedure before the transaction gets canceled. According to IEEE 802.15.4
the valid range of MAX_CSMA_RETRIES is 0 to 5. A value of MAX_CSMA_RETRIES =
7 initiates an immediate frame transmission without performing CSMA-CA. This may
especially be required for slotted acknowledgment operation. MAX_CSMA_RETRIES =
6 is reserved.
Table 9-68 MAX_CSMA_RETRIES Register Bits
• Bit 0 – SLOTTED_OPERATION - Set Slotted Acknowledgment
When using RX_AACK mode in networks operating in beacon or slotted mode
according
SLOTTED_OPERATION indicates that acknowledgment frames are to be sent on back-
off slot boundaries (slotted acknowledgment). If this register bit is set the
acknowledgment frame transmission has to be initiated by the application software
using bit SLPTR of register TRXPR. This waiting state is signaled in sub register
TRAC_STATUS of register TRX_STATE with value SUCCESS_WAIT_FOR_ACK.
Table 9-69 SLOTTED_OPERATION Register Bits
Register Bits
MAX_FRAME_RETRIES3:0
Register Bits
MAX_CSMA_RETRIES2:0
Register Bits
SLOTTED_OPERATION
transmission Attempts
Repetition Attempts
to
IEEE
802.15.4-2006,
Value
Value
Value
0xF
0x0
0x1
0x2
0x0
0x1
0x2
0x5
0x6
0x7
0
1
Description
Retransmission of frame is not attempted.
Retransmission of frame is attempted once.
...
Retransmission of frame is attempted 15
times.
Description
No repetition of CSMA-CA procedure
One repetition of CSMA-CA procedure
...
Five repetitions (highest IEEE 802.15.4
compliant value)
Reserved
Immediate frame re-transmission without
performing CSMA-CA
Description
The radio transceiver operates in unslotted
mode. An acknowledgment frame is
automatically sent if requested.
The transmission of an acknowledgment
frame has to be controlled by the
microcontroller.
chapter
ATmega128RFA1
5.5.1
the
register
129
bit