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MRF89XA Scheda tecnica(PDF) 78 Page - Microchip Technology |
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MRF89XA Scheda tecnica(HTML) 78 Page - Microchip Technology |
78 / 140 page MRF89XA DS70000622D-page 78 Preliminary 2010-2017 Microchip Technology Inc. FIGURE 3-22: TX PROCESSING IN BUFFERED MODE (FSIZE = 16, TXSTIRQ0 = 0)) 3.10.2 RX PROCESSING After entering RX in Buffered mode, the MRF89XA requires the host microcontroller to get the received data from the FIFO. The FIFO starts to be filled with received bytes either when a Sync Word has been detected (in this case only the bytes following the Sync Word are filled into the FIFO) or when the FIFOFSC bit (FPPRIREG<6>) is issued by the user depending on the state of bit, FIFOFM (FTPRIREG<7>). In Buffered mode, the packet length is not limited (that is, as long as FIFOFSC is set, the received bytes are shifted into the FIFO). The host microcontroller software must therefore manage the transfer of the FIFO contents by interrupt and ensure reception of the correct number of bytes. In this mode, even if the remote transmitter has stopped, the demodulator outputs random bits due to noise. When the FIFO is full, the FIFOFULL IRQ (source) is issued to alert the host microcontroller that at that time, the FIFO can still be unfilled without data loss. If the FIFO is not unfilled, after the SR is full (that is, 8 bits periods later), FOVRRUN is asserted and the SR’s content is lost. Figure 3-23 illustrates RX processing with a 16-byte FIFO size and FIFOFSC = 0. Note that in the example of Section 3.10.5, Buffered Mode Example, the host microcontroller does not retrieve any bytes from the FIFO through SPI data interface, causing an overrun. FIGURE 3-23: RX PROCESSING IN BUFFERED MODE (FSIZE = 16, FIFOFM = 0) b0 b1 b2 b3 b4 b5 b6 b7 b8 b9 b10 b11 b14 b15 b12 b13 b0 b1 FIFO 0 15 Data TX (from SR) Start condition IRQ0TXST FIFOEMPTY FIFOFULL TXDONE b5 b2 b3 b4 b6 b7 b8 b9 b10 b11 b12 b13 b14 b15 XXX XXX from SPI Data b0 b1 b2 b3 b4 b5 b6 b7 b8 b9 b10 b11 b14 b15 b12 b13 b16 Sync Preamble “noisy” data b0 b1 b5 b2 b3 b4 b6 b7 b8 b9 b10 b11 b12 b13 b14 b15 0 15 Data RX (to SR) Start condition (FIFOFM) FIFOEMPTY FIFOFULL FOVRRUN WRITEBYTE FIFO |
Codice articolo simile - MRF89XA |
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Descrizione simile - MRF89XA |
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