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CC2430-RTR1-F64Z データシート(PDF) 171 Page - Texas Instruments |
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CC2430-RTR1-F64Z データシート(HTML) 171 Page - Texas Instruments |
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171 / 234 page  CC2430 CC2430 PRELIMINARY Data Sheet (rev. 1.03) SWRS036A Page 171 of 232 signaled to the CPU by asserting the RFERR interrupt when enabled. In addition the radio will set RFSTATUS.FIFO bit low while the RFSTATUS.FIFOP bit is high. Data already in the RXFIFO will not be affected by the overflow, i.e. frames already received may be read out. A SFLUSHRX command strobe is required after a RXFIFO overflow to enable reception of new data. Note that the SFLUSHRX command strobe should be issued twice to ensure that the RFSTATUS.SFD bit goes back to its idle state. Preamble SFD Length Data received over RF SFD FIFO FIFOP , if threshold higher than frame length FIFOP , if threshold lower than frame length SF D de te cte d Le ng th by te re ce ive d La st M PD U by te re ce ive d Preamble SFD Length Data received over RF SFD FIFO FIFOP Ad dr es s r eg oc nit ion co m ple te d MAC Protocol Data Unit (MPDU) with correct address MAC Protocol Data Unit (MPDU) with wrong address Address recognition OK Address recognition fails Figure 41: SFD, FIFO and FIFOP activity examples during receive PSDU0 PSDU1 RXFIFO read data Length PSDU5 PSDU2 PSDU3 RSSI FIFOP FIFO PSDU4 FCS/Corr Figure 42: Example of status activity when reading RXFIFO. 14.9 Transmit mode During transmit, the RFSTATUS.FIFO and RFSTATUS.FIFOP bits are still only related to the RXFIFO. The RFSTATUS.SFD bit is however active during transmission of a data frame, as shown in |
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