AT86RF233 datasheet(41/225 Pages) ATMEL

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MCU Wireless AT86RF233 [PRELIMINARY DATASHEET]

Atmel-8351E-MCU_Wireless-AT86RF233_Datasheet_072014

7.1.3 Interrupt Handling

All interrupts provided by the Atmel AT86RF233 (see Table 6-10) are supported in

Basic Operating Mode. For example, interrupts are provided to observe the status of

radio transceiver RX and TX operations.

When being in receive mode, IRQ_2 (RX_START) indicates the detection of a valid

PHR first, IRQ_5 (AMI) an address match, and IRQ_3 (TRX_END) the completion of

the frame reception. During transmission, IRQ_3 (TRX_END) indicates the completion

of the frame transmission.

Figure 7-2 shows an example for a transmit/receive transaction between two devices

and the related interrupt events in Basic Operating Mode. Device 1 transmits a frame

containing a MAC header (in this example of length seven), MAC payload, and a valid

FCS. The end of the frame transmission is indicated by IRQ_3 (TRX_END).

The frame is received by Device 2. Interrupt IRQ_2 (RX_START) indicates the

detection of a valid PHR field and IRQ_3 (TRX_END) the completion of the frame

reception. If the frame passes the Frame Filter (refer to Section 8.2), an address match

interrupt IRQ_5 (AMI) is issued after the reception of the MAC header (MHR). The

received frame is stored in the Frame Buffer.

In Basic Operating Mode the third interrupt IRQ_3 (TRX_END) is issued at the end of

the received frame. In Extended Operating Mode, refer to Section 7.2; the interrupt is

only issued if the received frame passes the address filter and the FCS is valid. Further

exceptions are explained in Section 7.2.

Processing delay tIRQ is a typical value, refer to Section 12.4.

Figure 7-2. Timing of RX_START, AMI and TRX_END Interrupts in Basic Operating Mode.

128 160 192

192+(9+m)*32

-16

Time [µs]

IRQ_2 (RX_START)

tIRQ

RX_ON

IRQ

TRX_STATE

Interrupt latency

TRX_END

IRQ_5 (AMI)

tIRQ

BUSY_RX

IRQ_3 (TRX_END)

PLL_ON

BUSY_TX

PLL_ON

IRQ

SLP_TR

TRX_STATE

Typ. Processing Delay

Preamble

SFD

PHR

MSDU

Number of Octets

Frame Content

MHR

FCS

tTR10

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