用AT89S51單片機(jī)來制作的手動計數(shù)器
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?。担?匯編源程序
Count EQU 30H
SP1 BIT P3.7
ORG 0
START: MOV Count,#00H
NEXT: MOV A,Count
MOV B,#10
DIV AB
MOV DPTR,#TABLE
MOVC A,@A+DPTR
MOV P0,A
MOV A,B
MOVC A,@A+DPTR
MOV P2,A
WT: JNB SP1,WT
WAIT: JB SP1,WAIT
LCALL DELY10MS
JB SP1,WAIT
INC Count
MOV A,Count
CJNE A,#100,NEXT
LJMP START
DELY10MS: MOV R6,#20
D1: MOV R7,#248
DJNZ R7,$
DJNZ R6,D1
RET
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