Code

; TXD P1.0 = CLOCK
; RXD P1.1 = DATA

$NOMOD51			;   importes
#include "reg932.h"		;   for
				;   at
prog	SEGMENT CODE		;   undgå
	RSEG	prog		;   fejl
				;
?C_START:			;
	public ?C_START	       	;

	jmp 	80H	;
	org	80H	; hvad gør disse "!!!!"

 	mov	divm,#4		;(120KHz)
	mov	p1m1,#0		;
	mov	p1m2,#0		; sætter portene op
	mov	p1,#0H		;
	mov 	scon, #0 	; SKAL BRUGES DA DER ARBEJDES MED MODE-0


	call SEND_START
	mov a,#090h
	acall SEND_BYTE
	mov a,#0eeh
	acall SEND_BYTE
	acall SEND_STOP



SEND_START:
 /*        CLR         r5        ; OPERATION IS IN PROGRESS
         CLR         r6	       ; CLEAR STATUS FLAGS
         JNB         p1.0,FAULT
         JNB         p1.1,FAULT
*/         SETB        p1.1        ; BEGIN START CODITION
         setb	     p1.0
         CLR         p1.1
         ACALL       DEELAY ;nop
         CLR         p1.0
         RET
DEELAY:
	nop
	ret


SEND_STOP:
	clr p1.1
	setb p1.0
	setb p1.1
	ret

SEND_BYTE:
	mov 	r5,#08h

SB_LOOP:
	jnb acc.7,NOTONE
	setb p1.1
	jmp ONE

NOTONE:
	clr p1.1


ONE:
	setb p1.0
	RL A
	DJNZ r5,SB_LOOP
	setb p1.1
	setb p1.0
	JNB P1.1,SB_EX

SB_EX:
	acall DEELAY
	clr p1.0
	acall DEELAY
	ret








	end