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AT86RF231
10. Radio Transceiver Usage
This section describes basic procedures to receive and transmit frames using the AT86RF231.
For a detailed programming description refer to reference [6] .
10.1
Frame Receive Procedure
A frame reception comprises of two actions: The PHY listens for, receives and demodulates the
frame to the Frame Buffer and signalizes the reception to the microcontroller. After or while that
the microcontroller read the available frame data from the Frame Buffer via the SPI interface.
While in state RX_ON or RX_AACK_ON the radio transceiver searches for incoming frames on
the selected channel. Assuming the appropriate interrupts are enabled, a detection of an
IEEE 802.15.4 compliant frame is indicated by interrupt IRQ_2 (RX_START) first. The frame
reception is completed when issuing interrupt IRQ_3 (TRX_END).
Different Frame Buffer read access scenarios are recommended for:
? Non-time critical applications
? Time-critical applications
read access starts after IRQ_3 (TRX_END)
read access starts after IRQ_2 (RX_START)
Waiting for IRQ_3 (TRX_END) interrupt before starting a Frame Buffer read access is recom-
mended for operations considered to be none time critical. Figure 10-1 on page 126 illustrates
the frame receive procedure using IRQ_3 (TRX_END).
Figure 10-1. Transactions between AT86RF231 and Microcontroller during Receive
IRQ issued (IRQ_2)
Read IRQ status, pin 24 (IRQ) deasserted
IRQ issued (IRQ_3)
Read IRQ status, pin 24 (IRQ) deasserted
Read frame data (Frame Buffer access)
Critical protocol timing could require starting the Frame Buffer read access after interrupt
IRQ_2 (RX_START). The first byte of the frame data can be read 32 μs after the
IRQ_2 (RX_START) interrupt. The microcontroller must ensure to read slower than the frame is
received. Otherwise a Frame Buffer under run occurs, IRQ_6 (TRX_UR) is issued, and the
frame data may be not valid. To avoid this, the Frame Buffer read access can be controlled by
using a Frame Buffer Empty indicator, refer to Section 11.7 “Frame Buffer Empty Indicator” on
page 152 .
126
8111C–MCU Wireless–09/09
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AT86RF231-ZU_09 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:Low Power 2.4 GHz Transceiver for ZigBee
AT86RF231-ZUR 功能描述:射频收发器 2.4GHz, Zigbee Transceiver RoHS:否 制造商:Atmel 频率范围:2322 MHz to 2527 MHz 最大数据速率:2000 Kbps 调制格式:OQPSK 输出功率:4 dBm 类型: 工作电源电压:1.8 V to 3.6 V 最大工作温度:+ 85 C 接口类型:SPI 封装 / 箱体:QFN-32 封装:Tray
AT86RF232-ZX 功能描述:射频收发器 2.4 GHZ ZIGBEE TRANSCEIVER RoHS:否 制造商:Atmel 频率范围:2322 MHz to 2527 MHz 最大数据速率:2000 Kbps 调制格式:OQPSK 输出功率:4 dBm 类型: 工作电源电压:1.8 V to 3.6 V 最大工作温度:+ 85 C 接口类型:SPI 封装 / 箱体:QFN-32 封装:Tray
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