按键显示.asm

包含单片机开发的入门程序

ORG 0000H
LJMP MAIN
ORG 0030H
MAIN:
     MOV SP,#30H
     MOV P0,#0FFH
     MOV P2,#00H
     MOV P1,#0F0H
JIANCE:    MOV A,P1
           ORL A,#0FH
           CJNE A,#0FFH,QUDOU
           LJMP JIANCE
QUDOU:     LCALL DLY_10MS
           MOV   A,P1
           ORL A,#0FH
           CJNE A,#0FFH,ANJIAN
           LJMP JIANCE
ANJIAN:    MOV P1,#0F0H
           MOV A,P1
           ANL A,#0F0H
           MOV R0,A
           MOV P1,#0FH
           MOV A,P1
           ANL A,#0FH
           ORL A,R0
           MOV R1,A
IS_01:     CJNE A,#77H,IS_02
           LJMP KEY_01

IS_02:     CJNE A,#7BH,IS_03
           LJMP KEY_02

IS_03:     CJNE A,#7DH,IS_04
           LJMP KEY_03

IS_04:     CJNE A,#7EH,IS_05
           LJMP KEY_04

IS_05:     CJNE A,#0B7H,IS_06
           LJMP KEY_05

IS_06:     CJNE A,#0BBH,IS_07
           LJMP KEY_06

IS_07:     CJNE A,#0BDH,IS_08
           LJMP KEY_07

IS_08:     CJNE A,#0BEH,IS_09
           LJMP KEY_08

IS_09:     CJNE A,#0D7H,JIANCE
           LJMP KEY_09

KEY_01:     MOV P1,#0F0H
           MOV A,P1
           ORL A,#0FH
           CJNE A,#0FFH,KEY_01
           MOV P0,#0FEH
           MOV P2,#44H
           LJMP JIANCE
KEY_02:     MOV P1,#0F0H
           MOV A,P1
           ORL A,#0FH
           CJNE A,#0FFH,KEY_02
           MOV P0,#0FDH
           MOV P2,#3DH
           LJMP JIANCE
KEY_03:     MOV P1,#0F0H
           MOV A,P1
           ORL A,#0FH
           CJNE A,#0FFH,KEY_03
           MOV P0,#0FBH
           MOV P2,#6DH
           LJMP JIANCE
KEY_04:     MOV P1,#0F0H
           MOV A,P1
           ORL A,#0FH
           CJNE A,#0FFH,KEY_04
           MOV P0,#0F7H
           MOV P2,#47H
           LJMP JIANCE
KEY_05:     MOV P1,#0F0H
           MOV A,P1
           ORL A,#0FH
           CJNE A,#0FFH,KEY_05
           MOV P0,#0EFH
           MOV P2,#6BH
           LJMP JIANCE
KEY_06:     MOV P1,#0F0H
           MOV A,P1
           ORL A,#0FH
           CJNE A,#0FFH,KEY_06
           MOV P0,#0DFH
           MOV P2,#7BH
           LJMP JIANCE
KEY_07:     MOV P1,#0F0H
           MOV A,P1
           ORL A,#0FH
           CJNE A,#0FFH,KEY_07
           MOV P0,#0BFH
           MOV P2,#4CH
           LJMP JIANCE
KEY_08:     MOV P1,#0F0H
           MOV A,P1
           ORL A,#0FH
           CJNE A,#0FFH,KEY_08
           MOV P0,#7FH
           MOV P2,#7FH
           LJMP JIANCE           
KEY_09:    MOV P1,#0F0H
           MOV A,P1
           ORL A,#0FH
           CJNE A,#0FFH,KEY_09
           MOV P0,#0FFH
           MOV P2,#6FH
           LJMP JIANCE           
;10ms延时子程序
DLY_10MS:
 MOV R7,#250
DL1: NOP
 NOP
 NOP
 NOP
 DJNZ R7,DL1
 RET