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STC89LE53RC bảng dữ liệu(PDF) 154 Page - STCmicro Technology Co,.Ltd

tên linh kiện STC89LE53RC
Giải thích chi tiết về linh kiện  Enhanced 80C51 Central Processing Unit ,6T or 12T per machine cycle
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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.
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