8051 Program – parity generation

; parity generation
; even parity = 1
; input: 4000H
;output: 4004H
	ORG 0H
	IN_ADDR EQU 4000H
	OUT_ADDR EQU 4004H
MAIN:
	MOV DPTR,#IN_ADDR	; fill memory
	MOV A,#02H
	MOVX @DPTR,A
	LCALL PARITY
	SJMP MAIN
PARITY:
	MOV DPTR,#IN_ADDR
	MOVX A,@DPTR
	MOV R5,A
	MOV R2,#00
	MOV R3,#08
loop1 :	RRC A
	JNZ loop2
	INC R2
loop2 :	DJNZ R3,loop1
	MOV A,R2
	MOV B,#02
	DIV AB
	MOV A,B
	JNZ loop3
	MOV A,#01
	MOV R7,#0FFH
	SJMP loop4
loop3 :	MOV A,#00
	MOV R7,#00
loop4:	MOV DPTR,#OUT_ADDR
	MOVX @DPTR,A
	MOV P1,R7
	RET
	END

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List of topics: 8051

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