１、实验电路原理图如图38。通过实验台左下角电位器RW1输出0～5Ｖ直流电压送入ADC0809通道0(IN0),利用debug的输出命令启动Ａ/Ｄ转换器，输入命令读取转换结果，验证输入电压与转换后数字的关系。

启动IN0开始转换:　　Out 0298 0

读取转换结果:　　In 0298

２、编程采集IN0输入的电压,在屏幕上显示出转换后的数据（用16进制数）。-1, the experimental circuit shown in Figure 38. Potentiometer through the lower left corner bench RW1 0 ~ 5V DC output voltage into the ADC0809 Channel 0 (IN0), using the output of debug command to start the A/D converter, enter the command to read the conversion results, verify the input voltage and the converted number relationship. Start IN0 start the conversion: Out 0298 0 read the conversion result: In 0298 2, programming acquisition IN0 input voltage, the screen shows the converted data (16 decimal).