Rainbow-electronics ATmega128RFA1 Manual do Utilizador descarregar pdf (Página 60)

100

101

8266A-MCU Wireless-12/09

ATmega128RFA1

Table 9-13. Interrupt Handling in Extended Operating Mode

Mode Interrupt Description

TRX24_RX_START Indicates a PHR reception

TRX24_AMI Issued at address match

RX_AACK

TRX24_RX_END Signals completion of RX_AACK transaction if

successful

- A received frame must pass the address filter;

- The FCS is valid

TX_ARET TRX24_TX_END Signals completion of TX_ARET transaction

Both TRX24_PLL_LOCK Entering RX_AACK_ON or TX_ARET_ON state from

TRX_OFF state, the TRX24_PLL_LOCK interrupt

signals that the transaction can be started

RX_AACK

For RX_AACK it is recommended to enable the TRX24_RX_END interrupt. This

interrupt is issued only if a frame passes the frame filtering (see section "Frame

Filtering" on page 54) and has a valid FCS. This is different to Basic Operating Mode

(see section "Basic Operating Mode" on page 35). The use of the other interrupts is

optional.

On reception of a valid PHR a TRX24_RX_START interrupt is issued. The TRX24_AMI

interrupt indicates an address match (see filter rules in section "Frame Filtering" on

page 54). The completion of a frame reception with a valid FCS is indicated by the

TRX24_RX_END interrupt.

Thus it can happen that a TRX24_RX_START and/or a TRX24_AMI interrupt are

issued, but no TRX24_RX_END interrupt.

The end of an acknowledgment transmission is confirmed by a TRX24_TX_END

interrupt.

TX_ARET

In TX_ARET interrupt TRX24_TX_END is only issued after completing the entire

TX_ARET transaction.

Acknowledgement frames do not issue a TRX24_RX_START, TRX24_AMI or a

TRX24_RX_END interrupt.

All other interrupts as described in section Table 9-2 on page 34 are also available in

Extended Operating Mode.

9.4.2.7 Register Summary

The following registers (Table 9-14 below) are to be configured to control the Extended

Operating Mode:

Table 9-14. Register Summary

TRX_STATUS Radio transceiver status, CCA result

TRX_STATE Radio transceiver state control, TX_ARET status

TRX_CTRL_1 TX_AUTO_CRC_ON

PHY_CC_CCA CCA mode control, Table 9-21 on page 70

CCA_THRES CCA threshold settings, see "Overview" on page 70

XAH_CTRL_1 RX_AACK control

1 2 ... 55 56 57 58 59 60 61 62 63 64 65 ... 523 524

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