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Digital to Analog converter - DAC interfacing with 8051

Sample code for Digital to Analog converter - DAC interfacing with 8051.
Following code can be using for 8051 and 8052 ICs like: 89c51, 89c52, 89s51, 89s52, 89c2051.

;=========================================================
;    Downloaded from www.projectsof8051.com
;    MicroTronics Technologies
;=========================================================

                     ORG 0000h
                    mov P2,#00H
repeat:         call squarwave      ; generate square wave
                    call triwave           ; generate triangular wave
                    call stairwave       ; generate staircase wave
                    jmp repeat

squarwave:  mov P2,#FFH
                    call delay2sec
                    mov P2,#00H
                    call delay2sec
                    ret

triwave:       mov R7,#00H
triwave1:     mov P2,R7
                    inc R7
                    cjne R7,#FFH,triwave1
                    
                    mov R7,#FFH
triwave2:     mov P2,R7
                    djnz R7,triwave2
                    ret

stairwave:    mov P2,#00H
                    call delay2sec
                    mov P2,#20H
                    call delay2sec
                    mov P2,#40H
                    call delay2sec
                    mov P2,#80H
                    call delay2sec
                    ret

delay1sec:  mov r0,#10
del2:           mov r1,#250
del1:            mov r2,#250
                    djnz r2,$
                    djnz r1,del1
                    djnz r0,del2
                    ret

delay2sec:   mov r0,#20
del22:          mov r1,#250
del21:          mov r2,#250
                    djnz r2,$
                    djnz r1,del21
                    djnz r0,del22
                    ret

    END

;=========================================================
;    Downloaded from www.projectsof8051.com
;    MicroTronics Technologies
;=========================================================