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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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RX95HF датащи(PDF) 11 Page - STMicroelectronics |
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RX95HF датащи(HTML) 11 Page - STMicroelectronics |
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11 / 44 page  DocID023884 Rev 3 11/44 RX95HF Communication protocols 43 4 Communication protocols 4.1 Serial peripheral interface (SPI) 4.1.1 Polling mode In order to send commands and receive replies, the application software has to perform 3 steps. 1. Send the command to the RX95HF. 2. Poll the RX95HF until it is ready to transmit the response. 3. Read the response. The application software should never read data from the RX95HF without being sure that the RX95HF is ready to send the response. The maximum allowed SPI communication speed is fSCK. A Control byte is used to specify a communication type and direction: 0x00: Send command to the RX95HF 0x03: Poll the RX95HF 0x02: Read data from the RX95HF 0x01: Reset the RX95HF The SPI_SS line is used to select a device on the common SPI bus. The SPI_SS pin is active low. When the SPI_SS line is inactive, all data sent by the Master device is ignored and the MISO line remains in High Impedance state. Figure 6. Sending command to RX95HF Figure 7. Polling the RX95HF until it is ready MOSI 00000000 CMD LEN DATA DATA Control Byte MISO XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX Several data bytes MOSI 00000011 XXXXXX11 XXXXXX11 XXXXXX11 Control Byte MISO XXXXXXXX Flag Flag Flags are polled until data is ready (Bit 3 is set when data is ready) 00000XXX 00000XXX 00001XXX |
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