; MCU 8051 IDE - Demonstration code
; Compiler directives
$DATE(32/13/1907)Â Â ; Places date in page header
; $EJECT ; Places a form feed in listing
; $INCLUDE(file.asm) ; Inserts file in source program
; $LIST ; Allows listing to be output
; $NOLIST ; Stops outputting the listing
; $NOMOD ; No predefined symbols used
$OBJECT(file.hex) ; Places object output in file
; $NOOBJECT ; No object file is generated
$PAGING ; Break output listing into pages
; $NOPAGING ; Print listing w/o page breaks
$PAGELENGTH(10) ; No. of lines on a listing page
$PAGEWIDTH(20) Â Â ; No. of columns on a listing page
$PRINT(file.lst) ; Places listing output in file
; $NOPRINT ; Listing will not be output
; $SYMBOLS ; Append symbol table to listing
; $NOSYMBOLS ; Symbol table will not be output
$TITLE('demo - 3') ; Places string in page header
;; Summary of Cross Assembler Directives
;; -------------------------------------
a EQU 54d ; Define symbol
b0 DATA a / 2 ; Define internal memory symbol
c IDATA (b0*2-5) ; Define indirectly addressed internal memory
d BIT 070Q ; Define internal bit memory symbol
e CODE 0FFA5h ; Define program memory symbol
var SET (A * 44) MOD 9 - 14 ; Variable defined by an expression
CSEG at 20h ; Select program memory space
x: DB '34' ; Store byte values in program memory
y: DW 3334h ; Store word values in program memory
DSEG at 5d ; Select internal memory data space
m: DS 1 ; Reserve bytes of data memory
xseg ; Select external memory data space
n: DS 1 ; Reserve bytes of data memory
ISEG ; Select indirectly addressed internal memory space
o: DS 1 ; Reserve bytes of data memory
NOLIST ; Disable code listing
BSEG ; Select bit addressable memory space
r: DBIT 4 ; Reserve bits of bit memory
LIST ; Enable code listing
mc macro label ; Define macro instruction
IF 2 <> 2 OR 1 = 4
EXITM ; Exit macro
ENDIF
sjmp label
endm ; End of definition
CSEG ; <-- From now on, ORG refers to the code segment
main: ORG 0 ; Set segment location counter
IF 0 ; Begin conditional assembly block
USING 2 ; Select register bank (define AR0..7)
ELSE ; Alternative conditional assembly block
USING 2 ; Select register bank (define AR0..7)
ENDIF ; End conditional assembly block
mc main ; Macro instruction
END ; End of assembly language source file
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