8051 Family

The Intel 8051 is a single chip microcontroller which was developed by Intel in 1980 for use in embedded systems. It has become very popular in the 80s, but today many manufacturer proposes enhanced version that are 8051-compatible.

Architecture

Speed

• Standard 8051:
  • Supported clock frequencies: 12MHz, 16MHz, 20MHz, and 24MHz.
  • Clock cycles per instructions: 12 (ie. all instructions takes a multiple of 12 oscillation periods).
• Optimized 8051 (source: NXP):
  • Supported clock frequencies: from 7MHz to 40MHz.
  • Clock cycles per instructions: 2 (LPC900 family), 6 (LPC700 and 80C51 family), 12(80C51).

Links

• The 8051 on Wikipedia.
• My links on Del.icio.us.
• A website on 8051/8052 controllers [1].

Intel

• The classic version, with 128 byte RAM (http://www.intel.com/design/mcs51/cf_51.htm).
• The Expanded RAM version, with 384 byte RAM ([2]).
• Documentation page.

NXP

NXP (ex. Philips Semiconductors) offers a wide range of 8051-compatible controllers:

• 80C51 main product page
  • 80C51 product parametric filter
  • 80C51 support documents

• Microcontrollers support page
  • Microcontrollers support documents
  • Microcontrollers FAQ

• Some more links:
  • 8-bit 80C51 microcontrollers - more information page
  • 8XC51 8XC52 product page
  • 8XC54 8XC51 FX RX product page