OVERVIEW OF 8051 FAMILY

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Comparison of 8051 with its other family members

Introduction :

8051 is 8-bit microcontroller with 4 KB program memory and 128 Bytes data memory. Other features include four 8-bit ports, two 16-bit timers and one on-chip serial port. Overview of the 8051 Family : 8051 microcontroller was initially designed by Intel Corporation in 1981. Features of 8051 made it extremely popular in market. Because of it’s popularity and high demand Intel allowed other manufacturers to fabricate and market different variants of 8051 with a condition that all these variants should be code compatible with 8051. This resulted in a lot of variants of 8051 in market, among which 8052 and 8031 are the most popular ones. Therefore, 8052 and 8031 are considered as the family members of 8051.

  • 8052 – 8052 is the super set of 8051 as it has all the features of 8051 with an extra timer and an extra RAM of 128 bytes. Therefore, 8052 has a total of 256 bytes of RAM and 3 timers in all. Also all the programs written for 8051 will run on 8052 as 8052 is super set of 8051, but it’s reverse is not true.
  • 8031 – 8031 is referred to as ROM-less microcontroller chip because it has 0 K byes of on-chip ROM. For it’s operation, 8031 requires external ROM which aids it in fetch and execute operations. Apart from this, it shares almost all the features of 8051.
  • 80C31/80C52: The 80C31 and 80C52 are enhanced versions of the 8031 and 8052, respectively. They have additional features such as an on-chip oscillator, an expanded interrupt structure, and a power-down mode. These microcontrollers are also compatible with the 8051 in terms of pinout and instruction set.
  • AT89C51/52: The AT89C51 and AT89C52 are popular derivatives of the 8051 developed by Atmel Corporation. They have additional features such as an on-chip flash memory, an expanded interrupt structure, and a power-down mode. These microcontrollers are also compatible with the 8051 in terms of pinout and instruction set, making it easy to migrate code between them.
  • STC89C5x: The STC89C5x series of microcontrollers are based on the 8051 architecture but have additional features such as an on-chip flash memory, an expanded interrupt structure, and a power-down mode. They also have higher clock speeds and more I/O pins than the 8051. However, they are not fully compatible with the 8051 in terms of pinout and instruction set, so code migration between them requires some modifications.
  • P89V51RD2: The P89V51RD2 is a derivative of the 8051 developed by NXP Semiconductors. It has additional features such as an on-chip flash memory, an expanded interrupt structure, and a power-down mode. It also has a dual-data pointer and a programmable counter array. Like the STC89C5x, it is not fully compatible with the 8051 in terms of pinout and instruction set.

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