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AT86RF232
10 Radio Transceiver Usage
This section describes basic procedures to receive and transmit frames using the
Atmel AT86RF232. 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
recommended for operations considered to be none time critical. Figure 10-1 illustrates
the frame receive procedure using IRQ_3 (TRX_END).
Figure 10-1. Transactions between AT86RF232 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 32μs 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 11.5 .
123
8321A – MCU Wireless – 10/11
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