Description: File Name: A/D experiment- sampling, storage and display of experimental ASM
File identification: none
Applicable to devices: 89C51
① the ADC0809 s chip select CS1 with A15-, A14, RAM6116 chip select CS3 even.
The ② requirements with different analog signal input of the ADC0809, and start the channel number of the keyboard to enter the ADC0809 A/D converter,
Acquisition of N (eg, N = 256) data are stored in external RAM, open the the XDATA window, check the experimental results.
Note: ① The carrying out A/D sampling, you should first check ADC0809 reference voltage is correct.
(For the ADC0809 reference voltage value Vref =+5 V, to observe the ADC0809 chip 12-pin voltage with a multimeter.
If you are right, the experimental board adjustable potentiometer W1 to change the A/D reference voltage value).
② The board potentiometer W2 to adjust the value of the calibration signal (Note: The experimental on-board calibration signal is connected to channel 7 IN7).
(3) the value of th
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