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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STC89C53RC датащи(PDF) 154 Page - STCmicro Technology Co,.Ltd |
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STC89C53RC датащи(HTML) 154 Page - STCmicro Technology Co,.Ltd |
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154 / 165 page  Control Flow Operations The conditional assembly of section of code is provided by ASM51's control flow macro definition. The format is %IF (expression) THEN (balanced_text) [ELSE (balanced_text)] FI For example, INTRENAL EQU 1 ;1 = 8051 SERIAL I/O DRIVERS ;0 = 8251 SERIAL I/O DRIVERS . . %IF (INTERNAL) THEN (INCHAR: . ;8051 DRIVERS . OUTCHR: . . ) ELSE (INCHAR: . ;8251 DRIVERS . OUTCHR: . . ) In this example, the symbol INTERNAL is given the value 1 to select I/O subroutines for the 8051's serial port, or the value 0 to select I/O subroutines for an external UART, in this case the 8251. The IF macro causes ASM51 to assemble one set of drivers and skip over the other. Elsewhere in the program, the INCHAR and OUTCHR subroutines are used without consideration for the particular hardware configuration. As long as the program as assembled with the correct value for INTERNAL, the correct subroutine is executed. 154 |
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