关键词: SPI, SPI interface, SCK, MOSI, MISO, CS, I/O ports, bit banging, SPI peripheral.
Abstract: This article explains how to interface a GPIO port to an SPI peripheral. It defines the basics of the SPI protocol, the signals and the four transfer variations for the SCK signal. A software routine is included to implement the SPI interface using the MAX7651, a flash programmable 12-bit integrated data-acquisition system.
Interfacing SPI Peripherals to the MAX7651 Processor.pdf
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