Using AT89S53 for analog to digital conversion

Dear all,

I am trying to convert analog signal to digital signal using AT89S53. But that chip seem haven't any A/D converter.

My question is, can I convert analog signal to digital signal only using AT89S53 or I need to change to another chip?

If I can use AT89S53 for A/D conversion, how can I write the program code in C?


Thanks

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