8051 is the only processor core which is widely accepted and used. 8051 was in past, still used in today and will be used tomorrow.   8051 architecture was originally developed by intel co. in 1980. and now a days more then 20 manufacturer make chip around 8051 core. Some of them are ATMEL, NXP, Maxim etc.

8051 core has following characteristics.
8051 MICROCONTROLLER                                                                                                          8051 TUTORIALS

Everlasting Microcontroller
8-bit data bus - It can access 8 bits of data in one operation (hence it is an 8-bit microcontroller)
16-bit address bus - It can access 216 memory locations - 64 kB each of RAM and ROM
On-chip RAM - 128 bytes to 256 bytes
On-chip ROM - 4 kB to 64 kB
32 bi-directional input/output lines
8051 DEVELOPMENT TOOLS
COMPANY / ORGANIZATION LICENSE DESCRIPTION EMBEDDEDCRAFT LINK DOWNLOAD
SDCC FREE/GPL
Small Device C Compiler support 8051, motorola 68HC08 processor.
FREE 8051 DEVELOPMENT TOOLS COMPLETE / FULL
  PROPRIETARY
KEIL provide development tool for 8051 microcontroller. KEIL famous ide is uVision IDE. KEIL also provide development tools for ARM

How to work with KEIL Tools
EVALUATION

PROPRIETARY IAR provide development tools not only for 8051 but for AVR, ARM, MSP430, ColdFire etc. Visit IAR site for complete detail. IAR WORKBENCH PART 1

IAR WORKBENCH PART 2

IAR WORKBENCH PART 3
EVALUATION / KICKSTART
(4KB FREE LIFE PERIOD)
RTOS FOR 8051
COMPANY / ORGANIZATION LICENSE DESCRIPTION DOWNLOAD
  FREE/GNU Portable open source real time kernel.
COMPLETE / FULL

RTX51
PROPRIETARY RTOS kernel, It occupy up to 900 bytes in memory. Royalty free
RTX51 is priority based preemptive kernel.

EVALUATION

Salvo

PROPRIETARY Real time kernel for small systems
EVALUATION
KR-51


PROPRIETARY KR-51 is also availabe in lite version for free. RTOS support upto 125 tasks. Free version support upto 8 tasks. This is non preemptive kernel. EVALUATION
 
 
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UART
Two 16-bit Counter/timers
Power saving mode
Two external interrupt
Frequency 40 Khz
8051 DEVELOPMENT BOARDS
COMPANY / ORGANIZATION MANUFACTURER DESCRIPTION

MCBx51 Evaluation Board

  The Keil MCBx51 single-board computer is an evaluation board that supports numerous 8051-compatible and 251-compatible devices. The MCBx51 allows you to investigate the capabilities of the 8051 and 251 and create real working programs with the Keil development tools.
 
8051 ARTICLES / PRESENTATIONS / TUTORIAL
DESCRIPTION LINK TYPE
Free Development Toolchain for 8051 CLICK HERE HTML
Interrupt Programming for 8051 CLICK HERE HTML
8051 Programming: Interfacing LCD in 4 bit mode CLICK HERE HTML
8051 Programming: Interfacing via Serial Port CLICK HERE HTML
Stepper Interfacing with Microcontroller CLICK HERE HTML
USE OF IAR WORKBENCH PART 1 CLICK HERE PDF
USE OF IAR WORKBENCH PART 2 CLICK HERE PDF
USE OF IAR WORKBENCH PART 3 CLICK HERE PDF
Setup KEIL Development Tools for 8051 CLICK HERE HTML
Microcontroller Isp Programmer For AT89S51/52 / AVR CLICK HERE HTML
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