Numeric Constants and Radix

Numeric Constants and Radix

MPASM assembler supports the following radix forms for constants: hexadecimal, decimal, octal, binary, and ASCII. The default radix is hexadecimal; the default radix determines what value will be assigned to constants in the object file when a radix is not explicitly specified by a base descriptor.

Note: The radix for numeric constants can be different from the default radix specifed with the directives radix or list r=. Also, allowable default radices are limited to hexadecimal, decimal, and octal.

Constants can be optionally preceded by a plus or minus sign. If unsigned, the value is assumed to be positive.

Note: Intermediate values in constant expressions are treated as 32-bit unsigned integers. Whenever an attempt is made to place a constant in a field for which it is too large, a truncation warning will be issued.

The following table presents the various radix specifications:

Table: Radix Specifications

Type	Syntax	Example
Decimal	D'<digits>' .'<digits>'	D'100' .'100'
Hexadecimal	H'<hex_digits>' 0x<hex_digits>	H'9f' 0x9f
Octal	O'<octal_digits>'	O'777'
Binary	B'<binary_digits>'	B'00111001'
ASCII	A'<character>' '<character>'	A'C' 'C'