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DAC8552引脚连接问题?

Other Parts Discussed in Thread: DAC8552

我使用的主控制器是NXP的LPC1768现在用的是片上兼容SPI接口的SSP控制寄存器来操作DAC8552芯片,但SPI或者是SSP有4根线(CS、MOSI、MISO、SCK),但现在DAC8552芯片只有三根线,请问主控制器的MISO引脚不接可以吗?应该怎么处理。我编写了程序始终也不能控制DAC8552