Question

单片机 简单程序

编写程序，查找内部RAM的20H~50H单元中出现的00H的次数，并将查找的结果存入51H单元中

Answer 1

ORG 0000H
SJMP START
ORG 0100H
START:MOV R0,#20H
MOV R2,#00H
LOOP: MOV A,@R0
JNZ NEXT
INC R2
NEXT: INC R0
CJNZ R0,#51H,LOOP
MOV 52H,R2
END

和1楼程序差不多只不过稍微规范点

Answer 2

;
ORG 0000H
MOV R0, #20H
MOV R2, #0
LOOP:
MOV A, @R0
JNZ ASDF
INC R2
ASDF:
INC R0
CJNE R0, #51H, LOOP
MOV 51H, R2

SJMP $

END