c代码-中断控制pwm输出

#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
sbit led=P1^0;
sbit key=P3^2;
uchar code tabel[]={
10,/*,11,12,13,14,15,16,17,18,19*/
20,/*21,22,23,24,25,26,27,28,29,*/
30,/*,31,32,33,34,35,36,37,38,39*/
40,/*,40,39,38,37,36,35,34,33,32,31*/
50,
60,
70,
60,
50,
40,
30,/*29,28,27,26,25,24,23,22,21,*/
20,/*,19,18,17,16,15,14,13,12,11*/
10};

void keyscan(void);
void light(uchar x);
void delay(uchar x);

uchar js;
uchar ld;

main()
{