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  1. 8051 microcontroller is designed by Intel in 1981. It is an 8-bit microcontroller. It is built with 40 pins DIP (dual inline package), 4kb of ROM storage and 128 bytes of RAM storage, 2 16-bit timers. It consists of are four parallel 8-bit ports, which are programmable as well as addressable as per the requirement.
    www.tutorialspoint.com/microprocessor/microcontrollers_8051_architecture.htm
    www.tutorialspoint.com/microprocessor/microcontrollers_8051_architecture.htm
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    The Intel 8051 is an 8-bit microcontroller which means that most available operations are limited to 8 bits. There are 3 basic "sizes" of the 8051: Short, Standard, and Extended.
    RAM: 8051 Microcontroller has 128 Bytes of RAM which includes SFRs and Input / Output Port Registers. ROM: 8051 has 4 KB of on-chip ROM (Program Memory). I/O Ports: 8051 has four 8 – bit Input / Output Ports which are bit addressable and bidirectional. Timers / Counters: 8051 has two 16 – bit Timers / Counters.
    The success of the Intel 8051 spawned a number of clones, which are collectively referred to as the MCS-51 family of microcontrollers, which includes chips from vendors such as Atmel, Philips, Infineon, and Texas Instruments. The Intel 8051 is an 8-bit microcontroller which means that most available operations are limited to 8 bits.
    ROM: 8051 has 4 KB of on-chip ROM (Program Memory). I/O Ports: 8051 has four 8 – bit Input / Output Ports which are bit addressable and bidirectional. Timers / Counters: 8051 has two 16 – bit Timers / Counters. Serial Port: 8051 supports full duplex UART Communication.
  3. MCS-51 - Wikipedia

  4. Introduction to 8051 Microcontroller - GeeksforGeeks

  5. 8051 Architecture - In-depth explanation using old and modern …

  6. bing.com/videos
  7. What is 8051 Microcontroller? Definition, Architecture and ...

  8. 8051 Microcontroller Introduction and Basics - Electronics Hub

  9. Embedded Systems/8051 Microcontroller - Wikibooks

  10. A Beginner's Guide to 8051 Microcontroller - Circuits DIY

  11. Microcontrollers - 8051 Architecture - Online Tutorials Library

  12. 8051 Datasheet(PDF) - Intel Corporation

  13. Explore Intel’s history- The 8051 Microcontroller