9.3.2

单片机源程序三位依次显示动态扫描的例子

1 JZ、JNZ分支程序实例
JZ  		M0
MOV 	A,R4
JNZ 		M1
M0:
AJMP 	G0					
M1:
ACALL 	DP					
JZ 		OV2
JC 		OV2					
ORL 	09H,#80H
ORL		0DH,#80H				
MOV 	1DH,R5
MOV 	1EH,R6
MOV 	1FH,R7				
MOV 	R0,#25				
CLR	 	A
MOV 	R6,A
MOV 	R7,A					
CLR 	C
LOOP1:
JNC 		M2
ACALL 	ADD0
ADDC 	A,R1					
RET
2	JC、JNC分支程序实例

HSSV:
PUSH
CMP 	25H,#8
JC   	SND7				
SHR 	28H,#1			
              				
MOV	HSOCMD,#10H			
JNC  	SND02
SND01:
MOV 	HSOCMD, #30H		
SND02:
ADD 	HSOTIME,TIME1, #104	
INC	 	25H					
SJMP 	SND04
SND03:
MOV  	28H,@26H				
CMP 	28H, #0AH				
CLR 	25H
MOV  	HSOCMD, #10H 
ADD  	HSOTIME,TIME1, #104	
INC  	26H
MOV  	28H,@26H				
SJMP 	SND6
SND71:
OR  	24H, #40H				
SJMP 	SND03
SND7:
OR  	24H, #80H				
SND70:
MOV	26H, #DATA2			
CLR  	25H					
SND04:
POP 
RET						
3  JB、JNB分支程序实例

FPCP:
MOV 	A,R1					
XRL  	A,R5
JNB  	ACC.7,CP1			
CP0:
MOV 	A,R1
CLR  	C
SUBB  	A,R5					
RET
CP1:
MOV 	A,R1
JNB  	ACC.7,CP2			
ACALL 	CP2
JZ   	CP4					
CPL  	C					
RET
CP2:
MOV 	A,R4					
CLR  	C
SUBB  	A,R0
JNZ   	CP4					
CP3:
MOV	A,R5
SUBB  	A,R1					
JNZ   	CP4
MOV  	A,R6					
SUBB  	A,R2
JNZ   	CP4
MOV   	A,R7					
SUBB  	A,R3					
CP4:
RET	
					
4 CJNE分支程序实例

CJNE	A,#40H,NEQ
EQ:							
MOP
NEQ:							
JC		LOW					
NOP
LOW:						
NOP
RET
5 DJNZ分支程序实例

SETB	P1.1				
DL:
MOV	30H,#06H				
DL0:
MOV	31H,#0F2H
DL1:
DJNZ	30H,DL1				
DJNZ	30H,DL0				
CPL		P1.1					
AJMP	DL