demodulation.asm

Library for the 8051 microcontroller. such as math routine, hexBCD, LCD, Keyboard, I2C, Remote, Ke

	;===================================
	BSEG	AT	0H
	EXAM:		DBIT	1
	STARTWORK:	DBIT	1
	;==================================
	CSEG	AT	0H
	LJMP	START
	;==================================
	ORG	03H
	LJMP	EXT
	;=================================
	ORG	0BH
	LJMP	T0INT
	;================================
	ORG	13H
	LJMP	EXT1
	;==============================
	ORG	40H
	;==============================
	INIT:
	MOV	P3,#0FFH
	MOV	R0,#0H
	MOV	R1,#0AH
	MOV	IE,#7H
	MOV	TMOD,#21H
	MOV	TCON,#5H
	MOV	SCON,#40H
	MOV	TH0,#0FDH
	MOV	TL0,#055H
	MOV	TH1,#0E8H
	MOV	TL1,#0E8H
	SETB	TR1
	MOV	R0,#0H
	SETB	EA
	CLR	STARTWORK
	RET
	;==============================
	EXT:
	INC	R0
	END_EXT:
	RETI
	;==============================
	T0INT:
	CLR	TR0
	MOV	TH0,#0FDH
	MOV	TL0,#055H
	CJNE	R0,#1H,END_T0INT
	SETB	EXAM
	SETB	STARTWORK
	RETI
	;==============================
	END_T0INT:
	MOV	R0,#0H
	SETB	EXAM
	RETI
	;==============================
	EXT1:
	SETB	TR0
	RETI
	;==============================
	START:
	LCALL	INIT
	;==============================	
	SSS1:
	MOV	R1,#0AH
	CLR	P0.0
	JNB	STARTWORK,$
	;==============================
	MAIN:
       	JNB	EXAM,MAIN
	CLR	EXAM
	SETB	P0.0
	CJNE	R0,#1H,ZERO
	CLR	C
	JMP	FINISH
	;==============================
	ZERO:
	SETB	C
	;==============================
	FINISH:
	RRC	A
	MOV	R0,#0H
	DJNZ	R1,MAIN
	RLC	A
	MOV	SBUF,A
	CLR	STARTWORK
	JMP	SSS1
	;==============================	
	END