USE OF DUAL DATA POINTERS

Applies to: C51 C Compiler

Answer

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Information in this article applies to:

• C51 All Versions

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SYMPTOM

When I enable dual data pointer support for my device, I notice no change in the object code generated by the compiler.

CAUSE

The Keil toolset only provides dual data pointer support via the C libraries. It does not generate DDP instructions when compiling user code.

RESOLUTION

If you wish to take advantage of DDP support, use one of the following library functions.

• MEMCPY
• MEMMOVE
• MEMCMP
• STRCPY
• STRCMP

SEE ALSO

• Refer to Dallas 320, 420, 520, and 530 in the C51/CX51 User's Guide.

Article last edited on: 2005-07-15 10:02:11