Atmel

MCS-51 family summary
Description:	Single chip microcontroller, which include 8031, 8032, 8044, 8051, 8052, 8054, and 8058. The 8051 is the most popular of the family, and is contiuing to be produced
Type:	MCU
Original designer:	Intel
Date:	1980
Bit-width:	8 bit-width
Architecture:	Harvard architecture architecture
Technology:	NMOS, CMOS technology
Website:	http://www.8052.com/ (wikipedia article)

Atmel - MCS-51 family