ATMEGA256RZAV-8AU Atmel, ATMEGA256RZAV-8AU Datasheet - Page 45

• Manufacturer Part Number: ATMEGA256RZAV-8AU
• Description: MCU ATMEGA2561/AT86RF230 64-TQFP
• Manufacturer: Atmel
• Series: ATMEGAr

Specifications of ATMEGA256RZAV-8AU

• Frequency: 2.4GHz
• Modulation Or Protocol: 802.15.4 Zigbee
• Applications: ISM, ZigBee™
• Power - Output: 3dBm
• Sensitivity: -101dBm
• Voltage - Supply: 1.8 V ~ 3.6 V
• Current - Receiving: 15.5mA
• Current - Transmitting: 16.5mA
• Data Interface: PCB, Surface Mount
• Memory Size: 256kB Flash, 4kB EEPROM, 8kB RAM
• Antenna Connector: PCB, Surface Mount
• Package / Case: 64-TQFP
• Wireless Frequency: 2.4 GHz
• Interface Type: JTAG, SPI
• Output Power: 3 dBm
• For Use With: ATAVRISP2 - PROGRAMMER AVR IN SYSTEM
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Operating Temperature: -
• Data Rate - Maximum: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• For Use With/related Products: ATmega256

8 Functional Description
8.1 Introduction - Frame Format
Figure 8-1 IEEE 802.15.4-2003 Frame Format – PHY Layer Frame Structure
Figure 8-2 IEEE 802.15.4-2003 Frame Format – MAC Layer Frame Structure
8.1.1 PHY Protocol Layer Data Unit (PPDU)
8.1.1.1 Synchronization Header (SHR)
5131E-MCU Wireless-02/09
Figure 8-1 provides an overview of the physical layer frame structure as defined by the
IEEE 802.15.4-2003 standard. Figure 8-2 shows details of the defined MAC layer frame
structure.
The SHR consists of a four-octet preamble field (all zero), followed by a single SFD
octet which has the predefined value 0xA7. When transmitting, the SHR is automatically
generated by the AT86RF230, and prefixed to the frame that has been read from the
Frame Buffer. The transmission of the SHR requires 160 µs (10 symbols). This allows
the microcontroller to initiate a transmission and to start downloading the frame
contents subsequently. Note, that in this case the SPI transfer rate must be equal or
faster than the PHY data rate.
During frame reception, the SHR is used for PHY synchronization purposes. In Basic
Operating Mode an RX_START interrupt is issued 8 µs after detection of the SFD field.
AT86RF230
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