8051/8951 microcontroller Instruction Set
by Ranjith | November 19th, 2008.The instruction set is divided in to 5 categories. They are as follows:
- Arithmetic instructions
- Logic instructions.
- Data transfer instructions.
- Boolean variable manipulation instruction.
- Program and machine control instruction.
We have listed all the instructions of microcontroller with description, Bytes, Cycle. Each instructions are explained in the next pages one by one.

8051 Microcontroller Arithmetic instructions

8051 Microcontroller logic operation instructions

8051 Microcontroller data transfer instructions

8051 Microcontroller Boolean variable manipulation instructions

8051 microcontroller program and machine control instructions
All instructions are explained in the next pages.
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June 13th, 2009 at 10:54 pm
This post was very helpful!!! Thanks a lot mate!
January 15th, 2010 at 6:28 am
Highly impressed, discovered your post on Ask.Happy I finally tried it out. Not sure if its my Chrome browser,but sometimes when I visit your site, the fonts are really small? Anyway, love your blog and will check back.Bye
March 8th, 2010 at 6:18 pm
This is very helpful. . thanks a lot:)
April 2nd, 2010 at 8:54 pm
This is very helpful. . thanks a lot:)
July 12th, 2010 at 9:25 pm
hi im trying to design a circuit in which stepper motor is used to
control a five nozzle fountain(college project) so i know how to program
the motors …but i don’t know how to use a microcontrolller to
interpret various segment of music and then interface it with a
stepper motor simultaneously to get a
musical fountain of sorts….can you help me out?
thanks.
P.S: i personally prefer 8051 but they say its outdated …
what are my best alternatives…i know assembly language quite well.
July 27th, 2010 at 11:15 am
i want quistions plz