Editing Intel MCS-51 (section)

{{Short description|Single chip microcontroller series by Intel}}
{{Infobox CPU
| name = Intel 8051
| image = KL Intel P8051.jpg
| image_size = 
| alt = 
| caption = Intel P8051 [[microcontroller]]
<!----------------- General Info ----------------->
| produced-start = 
| produced-end = 
| soldby = 
| designfirm = 
| manuf1 = <!-- manuf1..5 -->
| cpuid = 
| code = 
<!----------------- Performance ------------------>
| slowest = 
| fastest = 
| slow-unit = 
| fast-unit = 
| fsb-slowest = 
| fsb-fastest = 
| fsb-slow-unit = 
| fsb-fast-unit = 
| hypertransport-slowest = 
| hypertransport-fastest = 
| hypertransport-slow-unit = 
| hypertransport-fast-unit = 
| qpi-slowest = 
| qpi-fastest = 
| qpi-slow-unit = 
| qpi-fast-unit = 
| dmi-slowest = 
| dmi-fastest = 
| dmi-slow-unit = 
| dmi-fast-unit = 
| data-width = 
| address-width = 
| virtual-width = 
<!-------------------- Cache --------------------->
| l1cache = 
| l2cache = 
| l3cache = 
| l4cache = 
| llcache = 
<!------- Architecture and classification -------->
| application = 
| size-from = 
| size-to = 
| arch1 = 
| microarch = 
| arch = 
| instructions = 
| extensions = 
<!----------- Physical specifications ------------>
| transistors =
| numcores = 
| gpu = 
| co-processor = 
| pack1 = <!-- pack1..9 -->
| sock1 = <!-- sock1..9 -->
<!--------- Products, models, variants ----------->
| core1 = <!-- core1..9 -->
| pcode1 = <!-- pcode1..9 -->
| model1 = <!-- model1..9 -->
| brand1 = <!-- brand1..9 -->
| variant = 
<!------------------  History  ------------------->
| predecessor = [[Intel MCS-48]]
| successor = Intel MCS-151 <!-- Not linking because it is a redirect to this article -->
}}
The '''Intel MCS-51''' (commonly termed '''8051''') is a single-chip [[microcontroller]] (MCU) series developed by [[Intel]] in 1980 for use in [[embedded system]]s. The architect of the Intel MCS-51 instruction set was [[John H.&nbsp;Wharton]].<ref>{{cite web |author=John Wharton |author-link=John H. Wharton |url=https://drive.google.com/uc?export=download&id=0B9rh9tVI0J5mZTFmZjRjZTItNDQ0Yy00MDFlLTgzZTgtM2I3MzVkMTliNTFl |title=An Introduction to the Intel MCS-51 Single-Chip Microcomputer Family |id=Application Note AP-69 |date=May 1980 |publisher=Intel Corporation}}</ref><ref name="Intel8051OralHistory">{{Citation
| url = http://archive.computerhistory.org/resources/text/Oral_History/Intel_8051/102658339.05.01.acc.pdf
| title = Intel 8051 Microprocessor Oral History Panel
| access-date = November 17, 2018
| publisher = [[Computer History Museum]]
| date = September 16, 2008
| archive-url = https://web.archive.org/web/20120225062256/http://archive.computerhistory.org/resources/text/Oral_History/Intel_8051/102658339.05.01.acc.pdf
| archive-date = February 25, 2012
| url-status = dead
}}.</ref> Intel's original versions were popular in the 1980s and early 1990s, and enhanced [[binary compatible]] derivatives remain popular today. It is a [[complex instruction set computer]] with separate memory spaces for program instructions and data.

Intel's original MCS-51 family was developed using N-type metal–oxide–semiconductor ([[NMOS logic|NMOS]]) technology, like its predecessor [[Intel MCS-48]], but later versions, identified by a letter C in their name (e.g., 80C51) use complementary metal–oxide–semiconductor ([[CMOS]]) technology and consume less power than their NMOS predecessors. This made them more suitable for battery-powered devices.

The family was continued in 1996 with the enhanced [[8-bit]] MCS-151 and the 8/[[16-bit|16]]/[[32-bit]] MCS-251 family of binary compatible microcontrollers.<ref name="1+2-51"/> While Intel no longer manufactures the MCS-51, MCS-151 and MCS-251 family, enhanced [[binary compatible]] derivatives made by numerous vendors remain popular today. Some derivatives integrate a [[digital signal processor]] (DSP) or a [[floating-point unit]] (coprocessor, FPU). Beyond these physical devices, several companies also offer MCS-51 derivatives as [[IP core]]s for use in [[field-programmable gate array]] (FPGA) or [[application-specific integrated circuit]] (ASIC) designs.