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The AT89C4051 Datasheet PDF is available to download for free on the LearnElectronics India website. This datasheet provides detailed information about the AT89C4051 chip, including its architecture, features, electrical characteristics, and more. The AT89C4051 chip is a low-power, high-performance CMOS 8-bit microcontroller with 4K bytes of Flash memory and 128 bytes of RAM. It also features four 8-bit I/O ports, two 16-bit timer/counters, a serial port, and two external interrupts.