8051 Family

The detail specifications of the 8051 are given below

8051 MC

The 8051 is the original member of the 8051 family. Which is refers to it as MCS-51. Following table shows the main features of the 8051.

Features	Quantity
RAM(bytes)	128
ROM	4K
Timers	2
Serial port	1
I/O pins	32
Interrupt sources	6

  

There are two other members of the 8051 family. Which are 8052 and 8031. 

8052 MC

The 8052 is another member of 8051 family.  The 8052 has all the standard features of the 8051 as well as some additional storage, timer and interrupt sources. Following table shows the important features of 8052.

Features	Quantity
RAM(bytes)	256
ROM	8K
Timers	3
Serial port	1
I/O pins	32
Interrupt sources	8

8031 MC

Another member of the 8051 family is 8031 which is referred to as ROM-less 8051 since it has no on-chip ROM. In order to use this MC you need to add extra ROM to it which contains the program that 8031 will fetch and execute. In the process of adding external ROM to 8031, you lose two of its Ports. This problem can be solved by adding external I/O to 8031. The external memory can ranges from 4Kbytes to 64Kbytes. The main features of the 8031 MC are given in the following table.

 

Features	Quantity
RAM(bytes)	128
ROM	0K
Timers	2
Serial port	1
I/O pins	32
Interrupt sources	6