ARM Technical Support Knowledge Articles

HOW COMPATIBLE IS THE 251 WITH THE 8051?

Applies to: C251 C Compiler

Answer

QUESTION

How compatible is the 251 with the 8051?

ANSWER

The 8xC251SB is 100% compatible with the 80C51Fx parts from Intel. Simply set the 251's configuration bytes for binary mode as follows:

Config0 = 0xDE
Config1 = 0xE7

and your 251 microcontroller runs all of your existing 8051 code with NO changes.

Article last edited on: 2004-06-07 11:01:58

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