51单片机定时器T1在工作方式2下生成占空比40%的方波

#include<reg51.h> #define uint unsigned int #define uchar unsigned char sbit p11=P1^1; sbit p12=P1^2; uchar cnt; int main() { TMOD=0X10; TH1=(65536-10000)/256; TL1=(65536-10000)%256; EA=1; ET1=1; TR1=1; cnt=0; while(1); } void t1() interrupt 3 { TH1=(65536-10000)/256; TL1=(65536-10000)%256; cnt++; if (cnt == 40) { p11=0; } if (cnt == 100) { p11=1; //p12=~p12; cnt=0; } }