AT89C52超声波测距器
点击数：7303 次 录入时间：03-04 11:49:30 整理：http://www.55dianzi.com 51单片机
MOV R5, A
MOV A, R6
RLC A
MOV R6, A
MOV A, R7
RLC A
MOV R7, A
MOV A, R0
RLC A
MOV R0, A
MOV A, R1
RLC A
MOV R1, A
JNC MULLOOP2
MOV A, R4
ADD A, R2
MOV R4, A
MOV A, R5
ADDC A, R3
MOV R5, A
MOV A, R6
ADDC A, #00H
MOV R6, A
MOV A, R7
ADDC A, #00H
MOV R7, A
MULLOOP2: DJNZ 46H, MULLOOP1
RET
;
;****************************************************
;* 四字节/两字节无符号数除法程序 *
;****************************************************
;R7R6R5R4/R3R2=R7R6R5R4(商)...R1R0(余数)
;
DIV4BY2: MOV 46H, #20H
MOV R0, #00H
MOV R1, #00H
DIVLOOP1: MOV A, R4
RLC A
MOV R4, A
MOV A, R5
RLC A
MOV R5, A
MOV A, R6
RLC A
MOV R6, A
MOV A, R7
RLC A
MOV R7, A
MOV A, R0
RLC A
MOV R0, A
MOV A, R1
RLC A
MOV R1, A
CLR C
MOV A, R0
SUBB A, R2
MOV B, A
MOV A, R1
SUBB A, R3
JC DIVLOOP2
MOV R0, B
MOV R1, A
DIVLOOP2: CPL C
DJNZ 46H, DIVLOOP1
MOV A, R4
RLC A
MOV R4, A
MOV A, R5
RLC A
MOV R5, A
MOV A, R6
RLC A
MOV R6, A
MOV A, R7
RLC A
MOV R7, A
RET
;
END
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本文关键字：超声波 51单片机，单片机-工控设备 - 51单片机
