图4.14.3
6. 汇编源程序 KEYBUF EQU 30H ORG 00H
START: MOV KEYBUF,#2 WAIT:
MOV P3,#0FFH CLR P3.4 MOV A,P3 ANL A,#0FH XRL A,#0FH JZ NOKEY1
LCALL DELY10MS MOV A,P3
图4.14.3
6. 汇编源程序 KEYBUF EQU 30H ORG 00H
START: MOV KEYBUF,#2 WAIT:
MOV P3,#0FFH CLR P3.4 MOV A,P3 ANL A,#0FH XRL A,#0FH JZ NOKEY1
LCALL DELY10MS MOV A,P3