This 8051 asm source code can be simulated using simulator Edsim51

; This program multiplexes the number 1234
; on the four 7-segment displays.
; Note: a logic 0 lights a display segment.

start:
SETB P3.3 ; |
SETB P3.4 ; | enable display 3
MOV P1, #11111001B ; put pattern for 1 on display
MOV P1, #0FFH ; clear the display
CLR P3.3 ; enable display 2
MOV P1, #10100100B ; put pattern for 2 on display
MOV P1, #0FFH ; clear the display
CLR P3.4 ; |
SETB P3.3 ; | enable display 1
MOV P1, #10110000B ; put pattern for 3 on display
MOV P1, #0FFh ; clear the display
CLR P3.3 ; enable display 0
MOV P1, #10011001B ; put pattern for 4 on display
MOV P1, #0FFH ; clear display
JMP start ; jump back to start

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