3:4任务五按键撞大 3.4.2控制程序 K S4: JB P3. 5. dODO SPK2: MOV R2,#50H LJMP KEY 4 SPK1: CPL P3. 2 DODO: SJMP MAIN LCALL DELAY DJNZ R2, SPKI KEY 1: Mov P1. #OFDH DJNZ Rl, SPK2 SJMP MAIN STMP MAIN KEY 2 Mov P1. #OFBH DELAY: moV R3.#10 SJMP MAIN KeY 3: Mov P1. #OFEH DEL: MOV R4, #50 D JNZ R4, SJMP MAIN DJNZ R3, DEL KEY 4: MOV R1.#10 END3．4 任务五 按键控制灯 3．4．2 控制程序 SPK2: MOV R2,#50H SPK1: CPL P3.2 LCALL DELAY DJNZ R2,SPK1 DJNZ R1,SPK2 SJMP MAIN DELAY: MOV R3,#10 DEL: MOV R4,#50 DJNZ R4,$ DJNZ R3,DEL END K_S4: JB P3.5,DODO LJMP KEY_4 DODO: SJMP MAIN KEY_1: MOV P1,#0FDH SJMP MAIN KEY_2: MOV P1,#0FBH SJMP MAIN KEY_3: MOV P1,#0FEH SJMP MAIN KEY_4: MOV R1,#10