Saturday, February 27, 2016

8051 History

Brief History of 8051 Microcontroller

  • In 1976, Intel Corporation introduced an 8-bit microcontroller under the name MCS-48. Later they released an improved version under the name MCS-51.
  • In 1981, Intel Corporation introduced an 8-bit microcontroller called 8051.
  • The 8051 is a Harvard architecture, CISC instruction set, single chip microcontroller (┬ÁC).
  • 8051 belongs to the MCS-51 family of microcontrollers by Intel.
  • 8051 had processor – 8 bit, RAM – 128 bytes, ROM – 4K, timer – 2, serial port – 1, IO port – 4 (4*8 = 32 IO pins), interrupt source – 6.
  • It was referred as system on chip.
  • Intel allowed other manufactures to make and market any flavor of 8051 with condition that they remain code compatible with original 8051.
  • There are different flavors of 8051 in terms of speed, ROM, RAM, timer and interrupt.
  • 8052 and 8031 are the two other members of 8051 family of microcontrollers.
  • Comparison of 8051 family microcontrollers.
  • Feature805180528031
    ROM on-chip4K8K0K
    RAM128256128
    Timer232
    IO port444
    Serial port111
    Interrupt source686
  • 8051 can have a maximum of 64K bytes of on-chip ROM.
  • External ROM, as large as 64K bytes must be attached to 8031 through IO ports.
  • External IO can be attached to 8031.
  • There are various versions of 8051 such as, EPROM version, Flash version, NVRAM version, OTP (one time programmable) version.
  • All the versions of 8051 microcontrollers can be programmed using 8051 instruction set.



Related topics:
8051 Features   |   8051 Pin Diagram   |   8051 Architecture   |   8051 Memory Types   |   8051 Memory Map

List of topics: 8051

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