ATMEGA128RFA1-ZU Atmel, ATMEGA128RFA1-ZU Datasheet - Page 109

• 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

9.12.12 PHY_CC_CCA – Transceiver Clear Channel Assessment (CCA) Control Register
8266A-MCU Wireless-12/09
µs. For manually initiated ED measurements in these modes the measurement period is
still 128 µs as long as the receiver is in RX_ON state. A value other than 0xFF indicates
the result of the last ED measurement.
Table 9-41 ED_LEVEL Register Bits
This register is provided to initiate and control a CCA measurement.
• Bit 7 – CCA_REQUEST - Manual CCA Measurement Request
A manual CCA measurement is initiated with setting CCA_REQUEST=1. The end of
the CCA measurement is indicated by the TRX24_CCA_ED_DONE interrupt. Register
bits CCA_DONE and CCA_STATUS of register TRX_STATUS are updated after a
CCA_REQUEST. The register bit is automatically cleared after requesting a CCA
measurement with CCA_REQUEST=1.
• Bit 6:5 – CCA_MODE1:0 - Select CCA Measurement Mode
The CCA mode can be selected using these register bits. 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 CCA_MODE=0 for logical
operation OR and CCA_MODE=3 for logical operation AND.
Table 9-42 CCA_MODE Register Bits
• Bit 4:0 – CHANNEL4:0 - RX/TX Channel Selection
These register bits define the RX/TX channel. The channel assignment is according to
IEEE 802.15.4.
Bit
NA ($148)
Read/Write
Initial Value
Bit
NA ($148)
Read/Write
Initial Value
Register Bits
ED_LEVEL7:0
Register Bits
CCA_MODE1:0
CCA_REQUEST
CHANNEL3
RW
RW
7
0
3
1
CCA_MODE1
CHANNEL2
RW
RW
6
0
2
0
Value
Value
0x00
0x01
0x02
0x54
0xFF
0
1
2
3
CCA_MODE0
CHANNEL1
Description
Minimum result of last ED measurement
P(RF) = RSSI_BASE_VAL+ED [dBm]
...
Maximum result of last ED measurement
Reset value
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
RW
RW
5
1
1
1
ATmega128RFA1
CHANNEL4
CHANNEL0
RW
RW
4
0
0
1
PHY_CC_CCA
PHY_CC_CCA
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