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NRF24L01P-R7 数据表(PDF) 55 Page - Nordic Semiconductor |
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NRF24L01P-R7 数据表(HTML) 55 Page - Nordic Semiconductor |
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55 / 78 page  Revision 1.0 Page 55 of 78 nRF24L01+ Product Specification Table 26. SPI timing parameters (Rpull = 50kΩ, Cload = 50pF) Table 27. SPI timing parameters (Rpull = 50kΩ, Cload = 100pF) 8.4 Data FIFO The data FIFOs store transmitted payloads (TX FIFO) or received payloads that are ready to be clocked out (RX FIFO). The FIFOs are accessible in both PTX mode and PRX mode. The following FIFOs are present in nRF24L01+: • TX three level, 32 byte FIFO • RX three level, 32 byte FIFO Both FIFOs have a controller and are accessible through the SPI by using dedicated SPI commands. A TX FIFO in PRX can store payloads for ACK packets to three different PTX devices. If the TX FIFO contains more than one payload to a pipe, payloads are handled using the first in - first out principle. The TX FIFO in a PRX is blocked if all pending payloads are addressed to pipes where the link to the PTX is lost. In this case, the MCU can flush the TX FIFO using the FLUSH_TX command. The RX FIFO in PRX can contain payloads from up to three different PTX devices and a TX FIFO in PTX can have up to three payloads stored. Symbol Parameters Min. Max Units Tdc Data to SCK Setup 2 ns Tdh SCK to Data Hold 2 ns Tcsd CSN to Data Valid 75 ns Tcd SCK to Data Valid 85 ns Tcl SCK Low Time 40 ns Tch SCK High Time 40 ns Fsck SCK Frequency 0 5 MHz Tr,Tf SCK Rise and Fall 100 ns Tcc CSN to SCK Setup 2 ns Tcch SCK to CSN Hold 2 ns Tcwh CSN Inactive time 50 ns Tcdz CSN to Output High Z 75 ns Symbol Parameters Min. Max Units Tdc Data to SCK Setup 2 ns Tdh SCK to Data Hold 2 ns Tcsd CSN to Data Valid 116 ns Tcd SCK to Data Valid 121 ns Tcl SCK Low Time 40 ns Tch SCK High Time 40 ns Fsck SCK Frequency 0 4 MHz Tr,Tf SCK Rise and Fall 100 ns Tcc CSN to SCK Setup 2 ns Tcch SCK to CSN Hold 2 ns Tcwh CSN Inactive time 50 ns Tcdz CSN to Output High Z 116 ns |
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