Difference between 8051 and 80C152

The 8051's predecessor, the 8048, was used in the keyboard of the first IBM PC, where it converted keypresses into the serial data stream which is sent to the main unit of the computer. The 8048 and derivatives are still used today[update] for basic model keyboards.

The 8031 was a cut down version of the original Intel 8051 that did not contain any internal program memory (ROM). To use this chip external ROM had to be added containing the program that the 8031 would fetch and execute.

The 8052 was an enhanced version of the original 8051 that featured 256 bytes of internal RAM instead of 128 bytes, 8 kiB of ROM instead of 4 kiB, and a third 16-bit timer. The 8032 had these same features except for the internal ROM program memory. The 8052 and 8032 are largely considered to be obsolete because these features and more are included in nearly all modern 8051 based microcontrollers.

Intel discontinued its MCS 51 product line in March 2007, however there are plenty of enhanced 8051 products or silicon IP from many vendors as indicated in the beginning of this article and external links section.

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The 80C152, which is based on the MCSÉ-51 CPU, is a highly integrated single-chip 8-bit microcontroller designed for cost-sensitive, high-speed, serial communications. It is well suited for implementing Integrated Services Digital Networks (ISDN), emerging Local Area Networks, and user defined serial backplane applications.
In addition to the multi-protocol communication capability, the 80C152 offers traditional microcontroller features for peripheral I/O interface and control.

The 80C152JB/JD is a ROMless extension of the 80C152 Universal Communication controller. The 80C152JB has the same five 8-bit I/O ports of the
80C152, plus an additional two 8-bit I/O ports, Port 5 and Port 6. The 80C152JB/JD also has two additional control pins, EBEN (EPROM Bus ENable), and
EPSEN (EPROM bus Program Store ENable).

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