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实验要求一：将频率为1MHz的时钟信号加载CLK0输入端，并让通道0工作于方式2。若选择计数初值N0=20000，则从OUT0端可得到序列负脉冲，其频率为1MHz/20000=50Hz，周期为20ms。再把该信号连到CLK1输入端，并使通道1工作于方式3。为了使OUT1输出周期为2秒（频率为1/2=0.5Hz）的方波，应取时间常数N1=50Hz/0.5Hz=100。
实验要求二：利用8255，8253控制LED显示，制作跑马灯。
编程代码：
-Experimental requirements: will the frequency of 1 MHZ clock signal loading CLK0 input, and let the channel 0 in mode 2. If choose count initial N0 = 20000, the negative pulse sequence can be obtained from the OUT0 end, its frequency is 1 MHZ/20000 = 50 hz, cycle of 20 ms. Connect the signal to the CLK1 input, and make the channel 1 work in 3 ways. In order to make the OUT1 output cycle for 2 seconds (square wave frequency for 1/2 = 0.5 Hz), should take time constant N1 = 50 Hz/0.5 Hz = 100.
Experimental requirements 2: use 8255825 3 control LED display, make entertaining diversions.
Programming code:
实验要求二：利用8255，8253控制LED显示，制作跑马灯。
编程代码：
-Experimental requirements: will the frequency of 1 MHZ clock signal loading CLK0 input, and let the channel 0 in mode 2. If choose count initial N0 = 20000, the negative pulse sequence can be obtained from the OUT0 end, its frequency is 1 MHZ/20000 = 50 hz, cycle of 20 ms. Connect the signal to the CLK1 input, and make the channel 1 work in 3 ways. In order to make the OUT1 output cycle for 2 seconds (square wave frequency for 1/2 = 0.5 Hz), should take time constant N1 = 50 Hz/0.5 Hz = 100.
Experimental requirements 2: use 8255825 3 control LED display, make entertaining diversions.
Programming code:
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下载文件列表
www/实验三报告.doc
www/试验1.ASM
www/试验2.ASM
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www/试验1.ASM
www/试验2.ASM
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