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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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ST25R3910 데이터시트(PDF) 19 Page - STMicroelectronics |
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ST25R3910 데이터시트(HTML) 19 Page - STMicroelectronics |
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19 / 65 page  DocID029768 Rev 2 19/65 ST25R3910 Functional overview 35 Figure 5. SPI communication: writing a single byte Figure 6. SPI communication: writing multiple bytes Reading data from addressable registers (Read mode) The command control byte for a read command consists of a command code and an address. After the command code, the address of register to be read has to be provided from the MSB to the LSB. Then one or more data bytes can be transferred from the SPI slave to the master, always from the MSB to the LSB. As in case of write, the read command supports auto-incrementing address. To transfer bytes from consecutive addresses, SPI master has to keep the SEN signal high and the SCLK has to be active as long as data need to be read from the slave. SDATAI is sampled at the falling edge of SCLK, data to be read from the ST25R3910 internal register is driven to SDATAO pin on rising edge of SCLK and is sampled by the MCU at the falling edge of SCLK. |
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