文件名称:mcn_sy4
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（1）通过开关K0合上与断开控制A/D转换的开始和停止，当开始A/D转换后，每秒对连接到PTB3的模拟量采样一次，结果送指示灯D7~D0显示。
（2）采样结果同步通过串行接口发送到PC机（38400bps，N，8，1），显示格式为“The signal is:x.xV”（满量程为5.0V）。
-(1) through the closed switch and disconnect K0 control A/D conversion start and stop, when to start A/D conversion, the second to connect to the analog PTB3 sampling time, the results sent to the indicator light shows that D7 ~ D0. (2) sampling the results of synchronous serial interface is sent to the PC machine (38400bps, N, 8,1), display format for " The signal is: x.xV" (full-scale to 5.0V).
（2）采样结果同步通过串行接口发送到PC机（38400bps，N，8，1），显示格式为“The signal is:x.xV”（满量程为5.0V）。
-(1) through the closed switch and disconnect K0 control A/D conversion start and stop, when to start A/D conversion, the second to connect to the analog PTB3 sampling time, the results sent to the indicator light shows that D7 ~ D0. (2) sampling the results of synchronous serial interface is sent to the PC machine (38400bps, N, 8,1), display format for " The signal is: x.xV" (full-scale to 5.0V).
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mcn_sy4.asm