222222.asm

来自「步进电机调速proteus仿真」· 汇编 代码 · 共 45 行

ORG  0H
        MOV SP,#60H
START:  JB P3.0,$
        JB     P3.1,REV
		ANL P1,#11110000B
FOR:    CLR    P1.3
         SETB P1.0
		 SETB  P1.1
		 ACALL SPEED
		 CLR    P1.0
         SETB P1.1
		 SETB  P1.2
		 ACALL SPEED
		 CLR    P1.1
         SETB P1.2
		 SETB P1.3
		 ACALL SPEED
		 CLR    P1.2
         SETB P1.3
		 SETB  P1.0
		 ACALL SPEED
		 AJMP START
REV:     CLR P1.0
          SETB P1.3
		  ACALL SPEED
		  CLR P1.3
          SETB P1.2
		  ACALL SPEED
		  CLR P1.2
          SETB P1.1
		  ACALL SPEED
		  CLR P1.1
          SETB P1.0
		  ACALL SPEED
SPEED:    MOV A,P2
          ANL A,#0FH
		  MOV R7,A
X2:       MOV R6,#20H
X1:       MOV R5,#90H
          DJNZ R5,$
		  DJNZ R6,X1
		  DJNZ R7,X2
		  RET
		  END