求一个51单片机的程序：一个按键控制led灯闪烁，就是按一下灯闪，再按灯就灭了

LED BIT P1.0KEY BIT P1.1ORG 0000HLJMP MAINORG 0030HMAIN: CLR 00HMAIN1: JB KEY,LOOP JNB KEY,$ CPL 00HLOOP: JNB 00H,LOOP1 CPL LED LCALL DELAY SJMP MAIN1LOOP1: SETB LED SJMP MAIN1DELAY: MOV R2,#200DLY: MOV R3,#250 DJNZ