8051单片机光敏电阻遮挡试验。 sbit CS=P1^6 //定义数模转换器硬件对应引脚 sbit CLK=P1^3 sbit DO=P1^4 sbit DI=P1^5 sbit LED=P1^2 sbit SPK=P3^0 -8051 the photoresistor block test. the sbit the CS = P1 ^ 6 //defines DAC hardware corresponds to pin the sbit the