给初学单片机的40个实验-2(15)

TR0=1; tcount=0; second=0;

P0=dispcode[second/10]; P2=dispcode[second%10]; while(1) {

if(TF0==1) {

tcount++;

if(tcount==20) {

tcount=0; second++;

if(second==60) {

second=0; }

P0=dispcode[second/10]; P2=dispcode[second%10]; }

TF0=0;

TH0=(65536-50000)/256; TL0=(65536-50000)%256; } } }

1． 汇编源程序（中断法） SECOND EQU 30H TCOUNT EQU 31H ORG 00H LJMP START ORG 0BH LJMP INT0X

START: MOV SECOND,#00H MOV A,SECOND MOV B,#10 DIV AB

MOV DPTR,#TABLE MOVC A,@A+DPTR MOV P0,A MOV A,B

MOVC A,@A+DPTR MOV P2,A