关于定时器初值的疑惑

[size=13.63636302947998px]  在网上找到一个程序，有点不理解，[size=13.63636302947998px]T“H0=0x9B; /* 装入定时器的初值 */  
[size=13.63636302947998px]TL0=0x9B; ”是赋初值39835吗?好奇怪的数字，搞不懂。希望好心人帮忙，谢谢！[size=13.63636302947998px]
/* =======直流电机的PWM速度控制程序======== */  
[size=13.63636302947998px]/* 晶振采用11.0592M,产生的PWM的频率约为91Hz */  
[size=13.63636302947998px]#include<reg51.h>  
[size=13.63636302947998px]#include<math.h>  
[size=13.63636302947998px]#define uchar unsigned char  
[size=13.63636302947998px]#define uint unsigned int  
[size=13.63636302947998px]sbit en1=P2^0;  /* L298的Enable A */  
[size=13.63636302947998px]sbit en2=P2^1;  /* L298的Enable B */  
[size=13.63636302947998px]sbit s1=P2^2;  /* L298的Input 1 */  
[size=13.63636302947998px]sbit s2=P2^3;  /* L298的Input 2 */  
[size=13.63636302947998px]sbit s3=P2^4;  /* L298的Input 3 */  
[size=13.63636302947998px]sbit s4=P2^5;  /* L298的Input 4 */  
[size=13.63636302947998px]uchar t=0;   /* 中断计数器 */  
[size=13.63636302947998px]uchar m1=0;   /* 电机1速度值 */  
[size=13.63636302947998px]uchar m2=0;   /* 电机2速度值 */  
[size=13.63636302947998px]uchar tmp1,tmp2; /* 电机当前速度值 */  
[size=13.63636302947998px]/* 电机控制函数 index-电机号(1,2); speed-电机速度(-100—100) */  
[size=13.63636302947998px]void motor(uchar index, char speed)  
[size=13.63636302947998px]{  
[size=13.63636302947998px]if(speed>=-100 && speed<=100)  
[size=13.63636302947998px]{  
[size=13.63636302947998px]  if(index==1) /* 电机1的处理 */  
[size=13.63636302947998px]  {  
[size=13.63636302947998px]   m1=abs(speed); /* 取速度的绝对值 */  
[size=13.63636302947998px]   if(speed<0) /* 速度值为负则反转 */  
[size=13.63636302947998px]   {  
[size=13.63636302947998px]    s1=0;  
[size=13.63636302947998px]    s2=1;  
[size=13.63636302947998px]   }  
[size=13.63636302947998px]   else /* 不为负数则正转 */  
[size=13.63636302947998px]   {  
[size=13.63636302947998px]    s1=1;  
[size=13.63636302947998px]    s2=0;  
[size=13.63636302947998px]   }  
[size=13.63636302947998px]  }  
[size=13.63636302947998px]  if(index==2) /* 电机2的处理 */  
[size=13.63636302947998px]  {  
[size=13.63636302947998px]   m2=abs(speed); /* 电机2的速度控制 */  
[size=13.63636302947998px]   if(speed<0) /* 电机2的方向控制 */  
[size=13.63636302947998px]   {  
[size=13.63636302947998px]    s3=0;  
[size=13.63636302947998px]    s4=1;  
[size=13.63636302947998px]   }  
[size=13.63636302947998px]   else  
[size=13.63636302947998px]   {  
[size=13.63636302947998px]    s3=1;  
[size=13.63636302947998px]    s4=0;  
[size=13.63636302947998px]   }  
[size=13.63636302947998px]  }  
[size=13.63636302947998px]}  
[size=13.63636302947998px]}  
[size=13.63636302947998px]void delay(uint j) /* 简易延时函数 */  
[size=13.63636302947998px]{  
[size=13.63636302947998px]for(j;j>0;j--);  
[size=13.63636302947998px]}  
[size=13.63636302947998px]void main()  
[size=13.63636302947998px]{  
[size=13.63636302947998px]char i;  
[size=13.63636302947998px]TMOD=0x02; /* 设定T0的工作模式为2 */  
[size=13.63636302947998px]TH0=0x9B; /* 装入定时器的初值 */  
[size=13.63636302947998px]TL0=0x9B;  
[size=13.63636302947998px]EA=1; /* 开中断 */  
[size=13.63636302947998px]ET0=1; /* 定时器0允许中断 */  
[size=13.63636302947998px]TR0=1; /* 启动定时器0 */  
[size=13.63636302947998px]while(1) /* 电机实际控制演示 */  
[size=13.63636302947998px]{  
[size=13.63636302947998px]  for(i=0;i<=100;i++) /* 正转加速 */  
[size=13.63636302947998px]  {  
[size=13.63636302947998px]   motor(1,i);  
[size=13.63636302947998px]   motor(2,i);  
[size=13.63636302947998px]   delay(5000);  
[size=13.63636302947998px]  }  
[size=13.63636302947998px]  for(i=100;i>0;i--) /* 正转减速 */  
[size=13.63636302947998px]  {  
[size=13.63636302947998px]   motor(1,i);  
[size=13.63636302947998px]   motor(2,i);  
[size=13.63636302947998px]   delay(5000);  
[size=13.63636302947998px]  }  
[size=13.63636302947998px]  for(i=0;i<=100;i++) /* 反转加速 */  
[size=13.63636302947998px]  {  
[size=13.63636302947998px]   motor(1,-i);  
[size=13.63636302947998px]   motor(2,-i);  
[size=13.63636302947998px]   delay(5000);  
[size=13.63636302947998px]  }  
[size=13.63636302947998px]  for(i=100;i>0;i--) /* 反转减速 */  
[size=13.63636302947998px]  {  
[size=13.63636302947998px]   motor(1,-i);  
[size=13.63636302947998px]   motor(2,-i);  
[size=13.63636302947998px]   delay(5000);  
[size=13.63636302947998px]  }  
[size=13.63636302947998px]}  
[size=13.63636302947998px]}  
[size=13.63636302947998px]void timer0() interrupt 1 /* T0中断服务程序 */  
[size=13.63636302947998px]{  
[size=13.63636302947998px]if(t==0) /* 1个PWM周期完成后才会接受新数值 */  
[size=13.63636302947998px]{  
[size=13.63636302947998px]  tmp1=m1;  
[size=13.63636302947998px]  tmp2=m2;  
[size=13.63636302947998px]}  
[size=13.63636302947998px]if(t<tmp1) en1=1; else en1=0; /* 产生电机1的PWM信号 */  
[size=13.63636302947998px]if(t<tmp2) en2=1; else en2=0; /* 产生电机2的PWM信号 */  
[size=13.63636302947998px]t++;  
[size=13.63636302947998px]if(t>=100) t=0; /* 1个PWM信号由100次中断产生 */  
[size=13.63636302947998px]}  

建军议小编了了解一下，定时器/计数器方面的知识。

嗯嗯嗯，好的。