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Technical Support On-Line Manuals Ax51 User's Guide ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
% OperatorThe percent operator ('%') is used to pass the value of an expression to a macro rather than passing the literal expression itself. The following example shows a macro definition that requires a numeric value along with macro invocations that use the percent operator to pass the value of an expression to the macro. OUTPORT MACRO N MOV R1, #N ENDM RESET_SIG EQU 0FFh CLEAR_SIG EQU 0 OUTPORT %(RESET_SIG AND NOT 11110000b) ; Expands into MOV R1, #15 OUTPORT %(CLEAR_SIG OR 11110000b) ; Expands into MOV R1, #240 The expressions evaluated in the highlighted lines could not be passed to the macro because the macro expects a numeric value. Expressions like these must be evaluated before the macro. The percent operator forces the assembler to generate a numeric value which is then passed to the macro. | ||||||||||
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