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The AT89C2051 datasheet PDF is available for free to download on the LearnElectronics India website. It provides technical information about the AT89C2051 chip, which is a low-power, high-performance CMOS 8-bit microcontroller based on the 80C51 architecture. It has 2K Bytes of Flash Program Memory, 128 Bytes of RAM, and 16 I/O Lines. The AT89C2051 is ideal for applications that require low power consumption, low cost and reduced pin count.