int0.src

单片机快速入门原程序

; .\int0.SRC generated from: int0.c
; COMPILER INVOKED BY:
;        e:\Keil\C51\BIN\C51.EXE int0.c BROWSE DEBUG OBJECTEXTEND SRC(.\int0.SRC)

$NOMOD51

NAME	INT0

P0	DATA	080H
P1	DATA	090H
P2	DATA	0A0H
P3	DATA	0B0H
T0	BIT	0B0H.4
AC	BIT	0D0H.6
T1	BIT	0B0H.5
EA	BIT	0A8H.7
IE	DATA	0A8H
RD	BIT	0B0H.7
ES	BIT	0A8H.4
IP	DATA	0B8H
RI	BIT	098H.0
INT0	BIT	0B0H.2
CY	BIT	0D0H.7
TI	BIT	098H.1
INT1	BIT	0B0H.3
PS	BIT	0B8H.4
SP	DATA	081H
OV	BIT	0D0H.2
WR	BIT	0B0H.6
SBUF	DATA	099H
PCON	DATA	087H
SCON	DATA	098H
TMOD	DATA	089H
TCON	DATA	088H
IE0	BIT	088H.1
IE1	BIT	088H.3
B	DATA	0F0H
ACC	DATA	0E0H
ET0	BIT	0A8H.1
ET1	BIT	0A8H.3
TF0	BIT	088H.5
TF1	BIT	088H.7
RB8	BIT	098H.2
TH0	DATA	08CH
EX0	BIT	0A8H.0
IT0	BIT	088H.0
TH1	DATA	08DH
TB8	BIT	098H.3
EX1	BIT	0A8H.2
IT1	BIT	088H.2
P	BIT	0D0H.0
SM0	BIT	098H.7
TL0	DATA	08AH
SM1	BIT	098H.6
TL1	DATA	08BH
SM2	BIT	098H.5
PT0	BIT	0B8H.1
PT1	BIT	0B8H.3
RS0	BIT	0D0H.3
TR0	BIT	088H.4
RS1	BIT	0D0H.4
TR1	BIT	088H.6
PX0	BIT	0B8H.0
PX1	BIT	0B8H.2
DPH	DATA	083H
DPL	DATA	082H
REN	BIT	098H.4
RXD	BIT	0B0H.0
TXD	BIT	0B0H.1
F0	BIT	0D0H.5
PSW	DATA	0D0H
?PR?externalint0?INT0                    SEGMENT CODE 
?XD?INT0             SEGMENT XDATA 
	PUBLIC	nTempb
	PUBLIC	nTempa
	PUBLIC	externalint0

	RSEG  ?XD?INT0
         nTempa:   DS   2
         nTempb:   DS   2
; #include <reg51.h>
; xdata int nTempa;
; xdata int nTempb;
CSEG	AT	00003H
	LJMP	externalint0

; void externalint0() interrupt 0 using 0

	RSEG  ?PR?externalint0?INT0
	USING	0
externalint0:
	PUSH 	ACC
	PUSH 	DPH
	PUSH 	DPL
	PUSH 	PSW
	USING	0
	MOV  	PSW,#00H
			; SOURCE LINE # 4
; {
; 	nTempa+=nTempb;
			; SOURCE LINE # 6
	MOV  	DPTR,#nTempb
	MOVX 	A,@DPTR
	MOV  	R6,A
	INC  	DPTR
	MOVX 	A,@DPTR
	MOV  	R7,A
	MOV  	DPTR,#nTempa+01H
	MOVX 	A,@DPTR
	ADD  	A,R7
	MOVX 	@DPTR,A
	MOV  	DPTR,#nTempa
	MOVX 	A,@DPTR
	ADDC 	A,R6
	MOVX 	@DPTR,A
; 	
; 	EA=1;
			; SOURCE LINE # 8
	SETB 	EA
; 	EX0=1;
			; SOURCE LINE # 9
	SETB 	EX0
; 	TH0=0x3C;	/* 计数初值写入TH0 */
			; SOURCE LINE # 10
	MOV  	TH0,#03CH
; 	TL0=0xAF;	/* 写入计数初值到TL0 */
			; SOURCE LINE # 11
	MOV  	TL0,#0AFH
; }			; SOURCE LINE # 12
	POP  	PSW
	POP  	DPL
	POP  	DPH
	POP  	ACC
	RETI 	
; END OF externalint0

	END