Technical Support

C51: DECLARING EXTERNAL SBITS

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Information in this article applies to:

• C51 Version 5.50
• C51 Version 6.00 Beta
• C51 Version 6.00

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SYMPTOMS

I have declared an sbit called foo in a source file called bar.c. In another source file, I have tried to declare the sbit as extern:

extern sbit foo;

However, when compiling I get a syntax error. What am I doing wrong?

RESOLUTION

When declaring an sbit as extern, you must use the 'bit' type. For example:

extern bit foo;

MORE INFORMATION

• Refer to sbit in the Cx51 User's Guide.
• Refer to bit in the Cx51 User's Guide.

FORUM THREADS

The following Discussion Forum threads may provide information related to this topic.

• Regarding sbit
• wrong compilation with bdata in .h (use of extern)
• Naming portbits globally
• how can i declare bit flag in header file ?

Last Reviewed: Monday, October 16, 2006

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