基于CD74HC595的特性，由MSP430F2619模拟SPI时序，发送待显示数据到LED显示屏上，由WDT定时器定时更新显示地址与显示内容！-CD74HC595-based features, the MSP430F2619 SPI timing simulation, sending data to be displayed on the LED display, the display is updated regularly by the WDT timer and display the contents of the address!