ATMEGA128RFA1-ZU Atmel, ATMEGA128RFA1-ZU Datasheet - Page 132

• 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

9.12.48 TST_CTRL_DIGI – Transceiver Digital Test Control Register
132
ATmega128RFA1
Table 9-71 MAX_BE Register Bits
• Bit 3:0 – MIN_BE3:0 - Minimum Back-off Exponent
These register bits define the minimum back-off exponent used in the CSMA-CA
algorithm to generate a pseudo random number for back off the CCA. For details refer
to IEEE 802.15.4-2006, section 7.5.1.4. Valid values are MAX_BE, MAX_BE-1), ..., 0.
If MIN_BE = 0 and MAX_BE = 0 the CCA back off period is always set to 0.
Table 9-72 MIN_BE Register Bits
This register takes part in the activation sequence of the continuous transmission test
mode. Other functionality of this register is reserved for internal use.
• Bit 7:4 – Resx7:4 - Reserved
Bit
NA ($176)
Read/Write
Initial Value
Bit
NA ($176)
Read/Write
Initial Value
Bit
NA ($176)
Read/Write
Initial Value
Bit
NA ($176)
Read/Write
Initial Value
Register Bits
MAX_BE3:0
Register Bits
MIN_BE3:0
TST_CTRL_DIG3
TST_CTRL_DIG1
Resx7
Resx5
RW
RW
RW
RW
7
0
5
0
3
0
1
0
Value
Value
1
2
3
4
8
0
1
8
Description
This value is not valid for the maximum
back-off exponent.
This value is not valid for the maximum
back-off exponent.
Minimum, IEEE compliant value for the
maximum back-off exponent.
...
Maximum, IEEE compliant value for the
maximum back-off exponent.
Description
Minimum value of minimum back-off
exponent.
...
Maximum value of minimum back-off
exponent. MIN_BE must be smaller or equal
to MAX_BE.
TST_CTRL_DIG2
TST_CTRL_DIG0
Resx6
Resx4
RW
RW
RW
RW
6
0
4
0
2
0
0
0
8266B-MCU Wireless-03/11
TST_CTRL_DIGI
TST_CTRL_DIGI
TST_CTRL_DIGI
TST_CTRL_DIGI