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AT86RF232
TRX_STATUS) changes back to TX_ARET_ON. The register bits TRAC_STATUS
(register 0x02, TRX_STATE) change to either TRAC_STATUS = SUCCESS, or
TRAC_STATUS = SUCCESS_DATA_PENDING if the frame pending subfield of the
received ACK frame was set to one.
7.2.5 Interrupt Handling
The Atmel AT86RF232 interrupt handling in the Extended Operating Mode is similar to
the Basic Operating Mode, refer to Section 7.1.3 . The microcontroller enables interrupts
by setting the appropriate bit in register 0x0E (IRQ_MASK).
For RX_AACK and TX_ARET modes the following interrupts inform about the status of
a frame reception and transmission:
Table 7-13. Interrupt Handling in Extended Operating Mode.
Mode
RX_AACK
TX_ARET
Both
Interrupt
IRQ_2 (RX_START)
IRQ_5 (AMI)
IRQ_3 (TRX_END)
IRQ_3 (TRX_END)
IRQ_0 (PLL_LOCK)
Description
Indicates a PHR reception
Issued at address match
Signals completion of RX_AACK transaction if
successful
A received frame must pass the address filter
-
The FCS is valid
-
Signals completion of TX_ARET transaction
Entering RX_AACK_ON or TX_ARET_ON state from
TRX_OFF state, the PLL_LOCK interrupt signals that
the transaction can be started
RX_AACK
For RX_AACK mode, it is recommended to enable IRQ_3 (TRX_END). This interrupt is
issued only if a frame passes the frame filtering, refer to Section 7.2.3.4 , and has a valid
FCS. This is in contrast to Basic Operating Mode, refer to Section 7.1.3 . The use of the
other interrupts is optional.
On reception of a valid PHR an IRQ_2 (RX_START) is issued. IRQ_5 (AMI) indicates
address match, refer to filter rules in Section 7.2.3.4 , and the completion of a frame
reception with a valid FCS is indicated by interrupt IRQ_3 (TRX_END).
Thus, it can happen that an IRQ_2 (RX_START) and/or IRQ_5 (AMI) are issued, but no
IRQ_3 (TRX_END) interrupt.
TX_ARET
In TX_ARET mode, interrupt IRQ_3 (TRX_END) is only issued after completing the
entire TX_ARET transaction.
Reception of acknowledgement
frames
does
not
issue
IRQ_5 (AMI)
or
IRQ_3 (TRX_END) interrupts.
All other interrupts as described in Section 6.6 , are also available in Extended
Operating Mode.
61
8321A – MCU Wireless – 10/11
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