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; MCU 8051 IDE - Demostration code
; Macro instructions, conditional compilation and constants
; Try tab "Graph" on bottom panel
; Press F2 and F6 to run the program (start simulator and animate)
$TITLE('DEMO 2') ; Set title for code listing
$DATE(36/-4/1907) ; Set date for code listing
; Constant definitions
; --------------------
counter idata 00Fh ; Counter of Px shifts
x set 100 ; Some variable
inc_dec equ 100 / X ; Flag: Increment/Decrement counter
cseg at 1FFh ; Code segment starts at 0x1FF
something: db 4d ; Reserve 4 bytes in this segment
; Macro instructions
; --------------------
;; Shift the given registeres
shift macro reg0, reg1
; Increment / Decrement counter
mov A, counter
if inc_dec <> 0
inc A
else
dec A
endif
$nolist ; <- Disable code listing
mov counter, A
$list ; <- Enable code listing
; Shift
mov reg1, reg0
mov reg0, reg1
setb C
mov A, reg0
rl A
mov reg0, A
endm
; Program initilization
; --------------------
org 0h
sjmp start
; Program start
; --------------------
start: mov P1, #00Fh
mov P3, #01Eh
sjmp main
; Main loop
; --------------------
main: shift P1, P3
sjmp main
; Program end
; --------------------
end
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