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C COMPILER->Compiler Data Formats->double

These are 64 bits wide.

If a global variable fVar is declared as double, then the least significant byte is located at address _fVar and the most significant byte is located at address _fVar+7.

The format for doubles is in accordance with IEEE754 double format:

Sign:	bit position 63 (1 bit)
Exponent:	bit positions 62 to 52 (11 bits)
Mantissa:	bit positions 51 to 0 (53 bits  the most significant bit is inferred)