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How to interface 2 ADC0804's to 89C51 in parallel combination. and program also.
All the necessary details will be provided in:
1. The Datasheet for the ADC0804, plus
2. The Datasheet for the specific "89C51" that you intend to use.
For additional supporting materials, see the manufacturer's website(s) for application notes, sample code, reference designs, etc...
If you can't or don't want to do it yourself, see: http://www.keil.com/condb
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