3:4任务五按键撞大 3.4.2控制程序 ORG 0000H PDO: LCALL DELAY LJMP MAIN DJNZ RI, PDO ORG 003OH mov A P3 MAIN: oRL P3. #3CH CJNE A, RO, dODO mov A P3 K Sl: JB P3.2,KS2 anL A,#3CH MP KEy 1 MOV RO. A K S2: JB P3.3,KS3 CJNE A, #3CH, MAINI LJMP KEY 2 SJMP MAIN K S3: JB P3.4,KS4 MAINI: Mov R1.#10 LJMP KEY 33．4 任务五 按键控制灯 3．4．2 控制程序 ORG 0000H LJMP MAIN ORG 0030H MAIN:ORL P3,#3CH MOV A,P3 ANL A,#3CH MOV R0,A CJNE A,#3CH,MAIN1 SJMP MAIN MAIN1:MOV R1,#10 PDO: LCALL DELAY DJNZ R1,PDO MOV A,P3 CJNE A,R0,DODO K_S1: JB P3.2,K_S2 LJMP KEY_1 K_S2: JB P3.3,K_S3 LJMP KEY_2 K_S3: JB P3.4,K_S4 LJMP KEY_3