MPASM Assembler/MPLINK Object Linker Help

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 made different from the default radix specified 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 - MPASM Assembler/MPLINK Linker

Note	Type	Syntax	Example
1	Binary	B’binary_digits’	B’00111001’
2	Octal	O’octal_digits’	O’777’
3	Decimal	D’digits’ .digits	D’100’ .100
4	Hexadecimal	H’hex_digits’ 0xhex_digits hex_digitsh	H’9f’ 0x9f 9fh
5	ASCII	A’character’ ’character’	A’C’ ’C’
1. A binary integer is �b’ or �B’ followed by one or more of the binary digits �01’ in single quotes. 2. An octal integer is �o’ or �O’ followed by one or more of the octal digits �01234567’ in single quotes. 3. A decimal integer is �d’ or �D’ followed by one or more decimal digits �0123456789’ in single quotes. Or, a decimal integer is �.’ followed by one or more decimal digits �0123456789’. 4. A hexadecimal integer is �h’ or �H’ followed by one or more hexadecimal digits �0123456789abcdefABCDEF’ in single quotes. Or, a hexadecimal integer is �0x’ or �0X’ followed by one or more hexadecimal digits �0123456789abcdefABCDEF’. Or, a hexadecimal integer is one or more hexadecimal digits �0123456789abcdefABCDEF’ followed by �h’ or �H’. 5. An ASCII character is �a’ or �A’ followed by one character in single quotes. Or, an ASCII character is one character in single quotes.

Microchip Support Help Updated: 2014-11-14 16:47:35Z Help Page: 42