单片机C51外部中断程序答:LED1 EQU 30H LED2 EQU 31H ORG 0000H LJMP MAIN ORG 000BH LJMP T0ISR ORG 0030H MAIN:MOV SP,#5FH MOV TMOD,#01H MOV TH0,#HIGH(65536-50000)MOV TL0,#LOW(65536-50000)SETB ET0 SETB EA MOV LED1,#0FEH MOV LED2,#00H MOV R0,#0 LOOP:MOV A,P3 ANL A,#0FH MOV B,A...