14.1.6 Sleep/Wake-up and Transmit Signal (SLP_TR)
SLP_TR is a multi-functional pin. Its function relates to the current state of the AT86RF212B and is summarized in table below. The radio transceiver states are explained in detail in the Operating Modes.
| Transceiver Status | Function | Transition | Description |
|---|---|---|---|
| PLL_ON | TX start | L ⇨ H | Starts frame transmission |
| TX_ARET_ON | TX start | L ⇨ H | Starts TX_ARET transaction |
| BUSY_RX_AACK | TX start | L ⇨ H | Starts ACK transmission during RX_AACK slotted operation |
| TRX_OFF | Sleep | L ⇨ H | Takes the radio transceiver into SLEEP state; CLKM disabled |
| SLEEP | Wakeup | H ⇨ L | Takes the radio transceiver back into TRX_OFF state, level sensitive |
| RX_ON | Disable CLKM | L ⇨ H | Takes the radio transceiver into RX_ON_NOCLK state and disables CLKM |
| RX_ON_NOCLK | Enable CLKM | H ⇨ L | Takes the radio transceiver into RX_ON state and enables CLKM |
| RX_AACK_ON | Disable CLKM | L ⇨ H | Takes the radio transceiver into RX_AACK_ON_NOCLK state and disables CLKM |
| RX_AACK_ON_NOCLK | Enable CLKM | H ⇨ L | Takes the radio transceiver into RX_AACK_ON state and enables CLKM |
In states PLL_ON and TX_ARET_ON, the signal SLP_TR is used as trigger input to initiate a TX transaction. Here SLP_TR is sensitive on rising edge only.
After initiating a state change by a rising edge at SLP_TR in radio transceiver states TRX_OFF, RX_ON or RX_AACK_ON, the radio transceiver remains in the new state as long as the pin is logical high and returns to the preceding state with the falling edge.