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Description: 74LS393和Intel8253中断应用
采用74LS393对实验箱中8MHz时钟进行分频处理，从中获得低于2MHz的时钟信号￠，并将时钟信号￠输入给Intel8253的某通道C。要求通道C的输出信号作为Intel8259的可屏蔽中断请求IRQ2，使得中央处理器每隔2秒钟中断一次，中断程序将中断次数采用二进制方式在8个发光二极管中显示出来
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Size: 1285 |
Author: ding |
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Description: 74LS393和Intel8253中断应用
采用74LS393对实验箱中8MHz时钟进行分频处理，从中获得低于2MHz的时钟信号￠，并将时钟信号￠输入给Intel8253的某通道C。要求通道C的输出信号作为Intel8259的可屏蔽中断请求IRQ2，使得中央处理器每隔2秒钟中断一次，中断程序将中断次数采用二进制方式在8个发光二极管中显示出来-74LS393 and 74LS393 used Intel8253 interruption of the application of the experimental box 8MHz clock frequency to deal with less than 2MHz gain ￠ of the clock signal and clock signal input to the Intel8253 ￠ a channel C. Requirements of channel C of the output signal as Intel8259 maskable interrupt request can be IRQ2, allows the CPU interrupt once every 2 seconds, interrupt procedure will interrupt the use of a binary number of 8 in the light-emitting diode shown
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Size: 1024 |
Author: ding |
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Description: 将信号波形数据存放在EEROM中，通过74LS393分频产生不同频率的刷新信号，输出存储器的数据，由DA输出，产生不同频率的信号。.
-The signal waveform data stored in EEROM, through the 74LS393 frequency divider to produce different frequency refresh signal, output of memory data, output by the DA, generate signals of different frequency.
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Size: 84992 |
Author: 刘清 |
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Description: === === === === === === === === === === ===
3． 比例电压变换器
要求：利用A/D和D/A实现将A/D的输入电压反向变换的功能，即A/D的输入电压
从0-5V变化时，D/A的输出电压相应的从+5V-0V变化。
控制功能：将仿真试验箱上的电位器W1产生0-5V电压输入到ADC0809的通道0。
利用74LS393将4MHz晶振产生的脉冲信号八分频后做为ADC0809的时钟信号
使用的主要元器件：8031、6MHz的晶振、74LS373、74LS138、2764、
4MHz晶振、74LS04、74LS393、ADC0809、DAC0832、LM324、电位器W1等。
结果验证：①用示波器检查ADC0809的时钟频率是否为500KHz。②旋动电位器W1
产生0-5V的电压，用数字万用表测量D／A的输出是否从5→0V变化。
③使W1的输出电压从0V开始，以0.5V为增量，测量D/A的输出电压并记录。
试分析误差产生的原因。-================================================== ============= 3. Proportional voltage converter requirements: the A/D and D/A to achieve the A/D input voltage inverse transform function, namely the A/D input voltage change 0-5V, D/A output voltage corresponding change from+5V-0V. Control functions: the potentiometer simulation chamber on W1 generate 0-5V voltage input to the ADC0809 channel 0. Use 74LS393 After pulse 4MHz crystal oscillator frequency as ADC0809 eighth clock signal the main components used: 8031,6MHz crystal, 74LS373,74LS138,2764, 4MHz crystal, 74LS04,74LS393, ADC0809, DAC0832 , LM324, potentiometer W1 and the like. Results show: ① ADC0809 oscilloscope to check whether the clock frequency of 500KHz. ② Turn the potentiometer W1 if a voltage of 0-5V, digital multimeter to measure the D/A output 5 → 0V change. ③ make W1 output voltage 0V to 0.5V increments measured D/A output voltage and recorded. Try to analyze the causes of error.
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Size: 28672 |
Author: 杨明 |
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