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USB3813 数据表(PDF) 31 Page - Microchip Technology |
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USB3813 数据表(HTML) 31 Page - Microchip Technology |
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31 / 57 page  USB 2.0 Hi-Speed 3-Port Hub Controller Optimized for Portable Applications Datasheet 2014 Microchip Technology Inc. DS00001715A-page 31 7.1.6 Byte Program Example To perform a Byte Program, the device writes 0x02 to the first byte of the command buffer, followed by a 3-byte address of the location that will be written to, and one data byte. The length of the transfer is set to 5 bytes. The device first drives SPI_CE_N low, then SPI_DO outputs 8 bits of command, followed by 24 bits of address, and one byte of data. SPI_DI is not used in this example. Figure 7.4 SPI Byte Program Sequence SPI_CE_N SPI_CLK 16 23 24 31 15 39 12 3 4 05 7 6 0x00 SPI_DO SPI_DI 8 0xDB MSB MSB 0xFE /0xFF Data MSB LSB 32 HIGH IMPEDANCE 0xBF |
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