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RF96 Datasheet(PDF) 112 Page - HOPE Microelectronics CO., Ltd. |
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RF96 Datasheet(HTML) 112 Page - HOPE Microelectronics CO., Ltd. |
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112 / 121 page  Page 112 RF96/97/98 Tel: +86-755-82973805 Fax: +86-755-82973550 E-mail: sales@hoperf.com http://www.hoperf.com WIRELESS & SENSING PRELIMINARY DATASHEET 7.3.2. Wake on SyncAddress Interrupt In another possible scenario, the sequencer polls for a Preamble detection and then for a valid SyncAddress interrupt. If events occur, the sequencer is switched off and the circuit stays in Receive mode until the user switches modes. Otherwise, the receiver is switched off until the next Rx period. 7.3.2.1. Timing Diagram Most of the sequencer running time is spent while no wanted signal is received. As shown by the timing diagram in Figure 48, the circuit wakes periodically for a short time, defined by RxTimeout. The circuit is in a Low Power mode for the rest of Timer1 + Timer2 (i.e. Timer1 + Timer2 - TrxTimeout) No wanted signal Idle Receive Idle ( Sleep + RC ) Receive Idle Timer1 Timer2 Timer1 Timer2 Timer1 RxTimeout RxTimeout Figure 48. Listen Mode with no SyncAddress Detected If a preamble is detected before RxTimeout timer ends, the circuit stays in Receive mode and waits for a valid SyncAddress detection. If none is detected by the end of Timer2, Receive mode is deactivated and the polling cycle resumes, without any user intervention. Unwanted Signal Preamble ( Preamble + Sync = T2 ) Wrong Word Payload Crc Idle Receive Idle Receive Idle Timer1 RxTimeout Timer2 Timer1 RxTimeout Timer2 Timer1 Preamble Detect Figure 49. Listen Mode with Preamble Received and no SyncAddress But if a valid Sync Word is detected, a SyncAddress interrupt is fired, the Sequencer is switched off and the circuit stays in Receive mode as long as the user doesn't switch modes. |
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