关键词: 1-wire networks, 1-wire switches, SPI peripherals, edge detector, one shot
Abstract: To produce the 3-wire SPI™ interface required by a MAX7221 display controller (active-low CS, DIN, and CLK), this 1-Wire® network serially addresses three 1-Wire switches (DS2413). The first switch creates Chip Select directly (active-low CS), the second creates the serial-data line directly (DIN), and the third switch—with the help of three exclusive-OR gates—creates the serial clock (CLK).
One-Wire Network Controls Remote SPI Peripherals.pdf 
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MCU
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