一个简易微机正弦信号发生器，并口外接8位D/A转换器（并口有8位 数据输出，4位控制位输入，接地信号，可以查阅相关资料）-a simple computer sinusoidal signal generator, Parallel external 8 D / A converter (8-bit parallel data is output, 4-control input signal grounding, can access information)

stc89c5a16s2单片机的ad模数转换，使用扫描法，可同时转换8路模拟信号-stc89c5a16s2 ad microcontroller analog-digital conversion, using the scanning method, which can convert 8 analog signals