20 May 2013 1:37:45
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Tech Note |
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AN704: AN Upward Migration Path For 80C51 XA Architecture |
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The 80C51 is arguably the most used 8-bit microcontroller architecture in the world, and a vast amount of public and private code exists for this processor. The “XA” (Extended Architecture) microcontroller, developed by Philips Semiconductors, is a high performance 16-bit processor that retains source code compatibility with the original 80C51. By permitting simple translation of source code, the XA allows existing 80C51 code to be re-used with a higher performance 16-bit controller. This provides an upward mobility path to a 16-bit controller for 80C51 users that has not previously existed, while also bringing a low cost, high performance, general purpose 16-bit controller to the market. How can a modern 16-bit controller provide compatibility with the venerable 80C51 without badly compromising the architecture and performance?
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