DSP的SPI工作原理DSP，CPLD，74HC595（串入并出的移位器），共阳数码管。SPIMOSI和

SPICLK直接从DSPJIE接到了74HC595的SER和SRCLK，作为数据和时钟信

号的输入，SPICS由CPLD引出来控制74HC595的选通。-DSP SPI works DSP, the CPLD, 74HC595 (string in and out of the shifter), Yang digital tube. The SPICLK SPIMOSI and directly from the DSPJIE received 74HC595 SER and SRCLK of, as the input data and clock signals, SPICS cited by the CPLD control 74HC595 gating.