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Note: The AT89C51 datasheet of the Microcontroller and more detailed Features can be found at the bottom of this page. The AT89C51 is an age old 8-bit microcontroller from the Atmel family. It works with the popular architecture and hence is used by most beginners till date. It is a 40 pin IC package with 4Kb flash memory. The AT89C51 is no longer in production and Atmel does not support new design.
Instead the new AT89S51 is recommended for new applications. But, since the AT89C51 has a strong community support if your motive is to learn embedded then AT89C51 can still be a good choice. Atmel microcontroller can be programmed with different software's that is available in the market. Arduino, Keil uVision are the most used platforms to name a few. If you are planning on serious programming and expansion with community support then Keil is recommended. In order to program the Atmel microcontroller we will need an IDE Integrated Development Environment , where the programming takes place.
Also simulating you program on software before trying it on hardware will save a lot of time. Their collection has just piled up after Microchip has acquired Atmel. Each MCU has its own advantage and disadvantage. The below points are just suggestions which might help one to select a MCU.
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AT89C51 Datasheet PDF