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;Sven Eisenhauer
;MPS1 Versuch 3 Aufgabe 3
;16.06.2005
LSTOUT-
$SFR80515.INC
LSTOUT+
ORG 0000h
MOV DPTR,#0F803h
MOV A,#92h
MOVX @DPTR,A
MOV P5,#0FFh
MOV P4,#0FFh
MOV P1,#0FFh
MOV DPTR,#0F800h
MOV A,#00h
MOVX @DPTR,A
INC DPTR
MOVX @DPTR,A
INC DPTR
MOVX @DPTR,A
MOV R0,#0
MOV R1,#0
MOV R2,#0
MOV R3,#0
BEGIN: JB P3.3,START
LJMP 8000h
START: LCALL EINLES
JNB P3.2,SUBJMP
LCALL ADDIT
SUBJMP: LCALL SUBST
SJMP BEGIN
SUBST: CLR C
CLR OV
CLR P3.4
CLR P3.5
MOV A,R0
SUBB A,R2
MOV R4,A ;LOWBYTE
MOV A,R1
SUBB A,R3
MOV R5,A ;HIGHBYTE
LCALL AUSG
RET
ADDIT: CLR C
CLR OV
CLR P3.4
CLR P3.5
MOV A,R0
ADD A,R2
MOV R4,A ;LOWBYTE
MOV A,R3
ADDC A,R1
MOV R5,A ;HIGHBYTE
LCALL AUSG
RET
AUSG: MOV P1,R4 ;LOWBYTE
MOV A,R5
MOV DPTR,#0F802h
MOVX @DPTR,A ;HIGHBYTE
MOV P3.4,C
JNB OV,NOOV
SETB P3.5
JB ACC.7,POS
MOV A,#08h ;Backspace
LCALL SENDSE
MOV A,#2Bh ;+
LCALL SENDSE
RET
POS: MOV A,#08h ;Backspace
LCALL SENDSE
MOV A,#2Dh ;-
LCALL SENDSE
RET
NOOV: CLR P3.5
MOV A,#08h ;Backspace
LCALL SENDSE
MOV A,#20h ;space
LCALL SENDSE
RET
EINLES: MOV DPTR,#0F800h ;Port A
MOVX A,@DPTR
MOV R1,A
MOV R0,P1
MOV DPTR,#0F801h ;Port B
MOVX A,@DPTR
MOV R3,A
MOV R2,P4
RET
SENDSE: MOV SBUF,A
CLR TI
WARTE: JNB TI, WARTE
RET
END
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