51单片机键盘汇编程序答:#0FH JZNOKEY MOVA,P3 ANLA,#0FH MOVR7,A SF:MOVA,P3 ANLA,#0FH XRLA,#0FH JNZSF MOVA,R7 CJNEA,#0EH,NK1 MOVKEYTM,#1 SJMPNOKEY NK1:CJNEA,#0DH,NK2 MOVKEYTM,#2 SJMPNOKEY NK2:CJNEA,#0BH,NK3 MOVKEYTM,#3 SJMPNOKEY NK3:CJNEA,#07H,NOKEY MOVKEYTM,#4 NOKEY:RET ...
单片机倒计时的编程答:ORG 0000H LJMP MAIN ORG 000BH LJMP T0ISR ORG 0030H MAIN:MOV TMOD,#01H MOV TH0,#HIGH(65536-10000)MOV TL0,#LOW(65536-10000)SETB TR0 SETB ET0 SETB EA MOV R0,#99 MOV R1,#0 LOOP:JB P1.0,LOOP1 JNB P1.0,INC R0 CJNE R0,#100,LOOP MOV R0,#99 SJMP LOOP LOOP1:J...
单片机问提请教答: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 ANL A,#0FH XRL A,#0FH JZ NOKEY1 MOV A,P3 ANL A,#0FH CJNE A,#0EH,NK1 MOV KEYBUF,#0 LJMP DK1 NK1: C...