code.asm

包含protue 7.2 仿真文件及汇编语言源代码。主要是一个4X4的键盘以及一个LCD显示显示屏。键盘输入显示在LCD上。

RS     BIT P3.5
RW     BIT P3.6
E      BIT P3.7
       ORG 00H
	   MOV SP,#70H
	   MOV P1,#01H
	   CALL ENABLE
	   MOV P1,#38H
	   CALL ENABLE 
	   MOV P1,#0FH
	   CALL ENABLE 
	   MOV P1,#06H
	   CALL ENABLE 
	   MOV P1,#80H
	   CALL ENABLE 
	   MOV DPTR,#TABLE1
	   CALL WRITE1
	   MOV P1,#0C0H
	   CALL ENABLE
	   MOV DPTR,#TABLE2
	   CALL WRITE1
	   MOV P1,#0C2H
	   CALL ENABLE 
	   ;***********************************************************  	 
L1:    MOV R3,#0F7H
       MOV R1,#00H
L2:    MOV A,R3
       MOV P2,A
	   MOV A,P2
	   MOV R4,A
	   SETB C
	   MOV R5,#03H
L3:    RLC A
       JNC KEYIN
	   INC R1
	   DJNZ R5,L3
	   MOV A,R3
	   SETB C
	   RRC A
	   MOV R3,A
	   JC L2
	   JMP L1
KEYIN: MOV R7,#10
D2:    MOV R6,#248
       DJNZ R6,$
	   DJNZ R7,D2
D3:    MOV A,P2
       XRL A,R4
	   JZ D3
	   MOV A,R1
	   MOV DPTR,#TABLE3
	   MOVC A,@A+DPTR
	   MOV R0,A
	   XRL A,#41H
	   JZ L1
	   MOV A,R0
	   XRL A,#42H
	   JZ CLEAR
	   MOV A,R0
	   CALL WRITE2
	   CALL CHECK
	   JMP L1
CHECK: MOV P1,#0FFH
       CLR RS
	   SETB RW
	   CLR E
	   NOP
	   SETB E
	   JB P1.7,CHECK
	   MOV A,P1
	   ANL A,#7FH
	   CJNE A,#48H,A3
	   MOV P1,#0C2H
	   CALL ENABLE 
A3:    RET
CLEAR:  MOV P1,#0C2H
       CALL ENABLE 
	   MOV R1,#06
A2:    MOV A,#30H
       CALL WRITE2
	   DJNZ R1,A2
	   MOV P1,#0C2H
	   CALL ENABLE 
	   JMP L1
ENABLE : CLR RS
         CLR RW 
		 CLR E
		 CALL DELAY
		 SETB E
		 RET
WRITE1:  MOV R1,#00H
A1:      MOV A,R1
         MOVC A,@A+DPTR
		 CALL WRITE2
		 INC R1
		 CJNE A,#00H,A1
		 RET 
WRITE2:  MOV P1,A
         SETB RS
		 CLR RW
		 CLR E
		 CALL DELAY
		 SETB E
		 RET
DELAY:   MOV R4,#05
D1:      MOV R5,#0FFH
         DJNZ R5,$
		 DJNZ R4,D1
		 RET
TABLE1:  DB	 'HELLO! PUZZLE',00H
TABLE2:  DB  'D:000000',00H
TABLE3:  DB  31H,32H,33H
	   	 DB	 34H,35H,36H
	     DB	 37H,38H,39H
		 DB	 41H,30H,42H
		 END