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STC89LE53RC Fiches technique(PDF) 154 Page - STCmicro Technology Co,.Ltd

No de pièce STC89LE53RC
Description  Enhanced 80C51 Central Processing Unit ,6T or 12T per machine cycle
PDF  165 Pages
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Fabricant  STC [STCmicro Technology Co,.Ltd]
Site Internet  http://www.stcmicro.com/
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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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