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AT86RF231-ZU Fiches technique(PDF) 49 Page - ATMEL Corporation |
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AT86RF231-ZU Fiches technique(HTML) 49 Page - ATMEL Corporation |
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49 / 198 page  49 8111C–MCU Wireless–09/09 AT86RF231 7.2.1 State Control The Extended Operating Mode states RX_AACK and TX_ARET are controlled via register bits TRX_CMD (register 0x02, TRX_STATE), which receives the state transition commands. The states are entered from TRX_OFF or PLL_ON state as illustrated by Figure 7-8 on page 48. The completion of each state change command shall always be confirmed by reading the register 0x01 (TRX_STATUS). RX_AACK - Receive with Automatic ACK A state transition to RX_AACK_ON from PLL_ON or TRX_OFF is initiated by writing the com- mand RX_AACK_ON to the register bits TRX_CMD. The state change can be confirmed by reading register 0x01 (TRX_STATUS), those changes to RX_AACK_ON or BUSY_RX_AACK on success. The latter one is returned if a frame is currently about being received. The RX_AACK state is left by writing command TRX_OFF or PLL_ON to the register bits TRX_CMD. If the AT86RF231 is within a frame receive or acknowledgment procedure (BUSY_RX_AACK) the state change is executed after finish. Alternatively, the commands FORCE_TRX_OFF or FORCE_PLL_ON can be used to cancel the RX_AACK transaction and change into radio transceiver state TRX_OFF or PLL_ON, respectively. TX_ARET - Transmit with Automatic Retry and CSMA-CA Retry Similarly, a state transition to TX_ARET_ON from PLL_ON or TRX_OFF is initiated by writing command TX_ARET_ON to register bits TRX_CMD. The radio transceiver is in the TX_ARET_ON state after TRX_STATUS (register 0x01) changes to TX_ARET_ON. The TX_ARET transaction is started with a rising edge of pin 11 (SLP_TR) or writing the command TX_START to register bits TRX_CMD. The TX_ARET state is left by writing the command TRX_OFF or PLL_ON to the register bits TRX_CMD. If the AT86RF231 is within a CSMA-CA, a frame-transmit or an acknowledgment procedure (BUSY_TX_ARET) the state change is executed after finish. Alternatively the com- mand FORCE_TRX_OFF or FORCE_PLL_ON can be used to instantly terminate the TX_ARET transaction and change into radio transceiver state TRX_OFF or PLL_ON, respectively. Note • A state change request from TRX_OFF to RX_AACK_ON or TX_ARET_ON internally passes the state PLL_ON to initiate the radio transceiver. Thus the readiness to receive or transmit data is delayed accordingly. It is recommended to use interrupt IRQ_0 (PLL_LOCK) as an indicator. |
Numéro de pièce similaire - AT86RF231-ZU_09 |
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Description similaire - AT86RF231-ZU_09 |
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