51單片機的LCD1602液晶屏密碼鎖匯編程序
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;
;
ORG 0000H
;========== 主程序開始 ==============
MAIN:
MOV 43H,#250
;44H號單元存放輸入錯誤的次數
;46H為定時器1中斷次數
MOV SP,#60H
MOV TH1,#3CH
SETB ET0
SETB ET1
START:
SS1: MOV @R1,#00H
INC R1
MOV R1,#31H
CLR 21H
MOV 46H,#00H
INIT:
setb EX0
KEYIN:
clr EX0
;當使用邊沿觸發時用上面的指令為什么禁止不了中斷???
;========== 密碼判斷程序 ============
COMP:
LOOP:
;正確
MATCH:
ACALL LINE2
MOV DPTR,#TAB_1
ACALL DISPLAY
MOV 44H,#00H
CLR OPEN
;錯誤
ERR:
ACALL BACK
INC
MOV A,44H
EE0:
MOV 44H,#00H
ACALL WRANING
ERROUT: JMP START
;=========== 按鍵中斷服務程序 ==========
KEY_INT:push acc
clr ex0
MOV A,KEYNUMBER
clr tr1
mov 46h,#00h
K1:
KEY_RTN:pop psw
setb ex0
;=========== 按鍵識別程序 ==========
SMKEY:
ANL A,#0FH
WKEY:
NOP
MOV A,P1
ANL A,#0F0H
ORL A,B
MOV P1,#0FH
CJNE A,#0EEH,WKEY1
MOV KEYNUMBER,#00H
AJMP RETURN
WKEY1:
MOV KEYNUMBER,#01H
AJMP RETURN
WKEY2:
MOV KEYNUMBER,#02H
AJMP RETURN
WKEY3:
MOV KEYNUMBER,#03H
AJMP RETURN
WKEY4:
MOV KEYNUMBER,#04H
AJMP RETURN
WKEY5:
MOV KEYNUMBER,#05H
AJMP RETURN
WKEY6:
MOV KEYNUMBER,#06H
AJMP RETURN
WKEY7:
MOV KEYNUMBER,#07H
AJMP RETURN
WKEY8:
MOV KEYNUMBER,#08H
AJMP RETURN
WKEY9:
MOV KEYNUMBER,#09H
AJMP RETURN
WKEY10:
MOV KEYNUMBER,#0AH
AJMP RETURN
WKEY11:
MOV KEYNUMBER,#0BH
RETURN:
ANL A,#0FH
JNZ RETURN
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