Numeric constants are 32-bit integers. You can set them using unsigned numbers in the range 0 to 2³²-1, or signed numbers in the range -2³¹ to 2³ -1. However, the assembler makes no distinction between -n and 2³²-n. Relational operators such as >= use the unsigned interpretation. This means that 0 > -1 is {FALSE}.

Use the EQU directive to define constants. You cannot change the value of a numeric constant after you define it. You can construct expressions by combining numeric constants and binary operators.