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The SPISTE pin operates as the slave-select pin. An active-low signal on the SPISTE pin allows the slave
SPI to transfer data to the serial data line; an inactive- high signal causes the slave SPI serial shift register
to stop and its serial output pin to be put into the high-impedance state. This allows many slave devices to
be tied together on the network, although only one slave device is selected at a time.
低电平有效，而在引脚复用时，此信号的表示方式为SPISTE，那么此时是高电平有效吗？
