C51: SUPPORT FOR FLOATING-POINT NUMBERS

Information in this article applies to:

• C51 All Versions

QUESTION

Does the Keil C Compiler for the 8051 support floating-point numbers? Where can I get more information about floating point numbers?

I have been programming 8031 chips with PL/M-51 for a number of years. Apparently, the PL/M compiler does not support floating-point numbers. I needed to divide 1E6 by 3000, but could not.

ANSWER

Yes. The Keil C Compiler for the 8051 supports 32-bit, single-precision floating-point numbers.

MORE INFORMATION

• Refer to Floating-point Numbers in the Cx51 User's Guide.
• Check the IEEE Standard 754 Floating Point Numbers for more details on the internal storage format of floating-point numbers.
• Refer to the C51 Benchmarks for performance details of Keil Float math library routines.

SEE ALSO

• GENERAL: WHAT IS A FLOATING-POINT OPERATION?
• GENERAL: FLOATING-POINT STANDARD
• C51: FLOATING POINT LIBRARY ROUTINES REGISTER USAGE
• GENERAL: CONVERTING FLOATING-POINT NUMBER TO INTEGER
• C51: DATA TYPE QUESTION
• C51: MATH OPERATIONS SUPPORTED
• C51: ARE 32-BIT SFRS SUPPORTED?
• GENERAL: PRECISION OF PRINTF %F FORMAT STRING
• C51: EVAL AND THE FLOATING-POINT LIBRARY
• C51: _CHKFLOAT_ RETURNS STRANGE VALUES

Last Reviewed: Friday, July 15, 2005