为什么51单片机用这个程序输出的PWM波频率调不上去，2K以后不行了（仿真的）怎么调到10K

#include <reg52.h>

sbit PWMOUT = P0^0

sbit ADDR0 = P1^0

sbit ADDR1 = P1^1

sbit ADDR2 = P1^2

sbit ADDR3 = P1^3

sbit ENLED = P1^4

unsigned long PeriodCnt = 0 //PWM周期计数值

unsigned char HighRH = 0 //高电平重载值的高字节

unsigned char HighRL = 0 //高电平重载值的低字节

unsigned char LowRH = 0 //低电平重载值的高字节

unsigned char LowRL = 0 //低电平重载值的低字节

unsigned char T1RH = 0 //T1重载值的高字节

unsigned char T1RL = 0 //T1重载值的低字节

void ConfigTimer1(unsigned int ms)

void ConfigPWM(unsigned int fr, unsigned char dc)

void main()

{

EA = 1//开总中断

ENLED = 0 //使能独立LED

ADDR3 = 1

ADDR2 = 1

ADDR1 = 1

ADDR0 = 0

ConfigPWM(100, 10) //配置并启动PWM

ConfigTimer1(50) //用T1定时调整占空比

while (1)

}

/* 配置并启动T1，ms-定时时间 */

void ConfigTimer1(unsigned int ms)

{

unsigned long tmp //临时变量

tmp = 11059200 / 12 //定时器计数频率

tmp = (tmp * ms) / 1000 //计算所需的计数值

tmp = 65536 - tmp //计算定时器重载值

tmp = tmp + 12 //补偿中断响应延时造成的误差

T1RH = (unsigned char)(tmp>>8) //定时器重载值拆分为高低字节

T1RL = (unsigned char)tmp

TMOD &= 0x0F //清零T1的控制位

TMOD |= 0x10 //配置T1为模式1

TH1 = T1RH//加载T1重载值

TL1 = T1RL

ET1 = 1 //使能T1中断

TR1 = 1 //启动T1

}

/* 配置并启动PWM，fr-频率，dc-占空比 */

void ConfigPWM(unsigned int fr, unsigned char dc)

{

unsigned int high, low

PeriodCnt = (11059200/12) / fr//计算一个周期所需的计数值

high = (PeriodCnt*dc) / 100 //计算高电平所需的计数值

low = PeriodCnt - high //计算低电平所需的计数值

high = 65536 - high + 12 //计算高电平的定时器重载值并补偿中断延时

low = 65536 - low + 12 //计算低电平的定时器重载值并补偿中断延时

HighRH = (unsigned char)(high>>8)//高电平重载值拆分为高低字节

HighRL = (unsigned char)high

LowRH = (unsigned char)(low>>8) //低电平重载值拆分为高低字节

LowRL = (unsigned char)low

TMOD &= 0xF0 //清零T0的控制位

TMOD |= 0x01 //配置T0为模式1

TH0 = HighRH //加载T0重载值

TL0 = HighRL

ET0 = 1 //使能T0中断

TR0 = 1 //启动T0

PWMOUT = 1//输出高电平

}

/* 占空比调整函数，频率不变只调整占空比 */

void AdjustDutyCycle(unsigned char dc)

{

unsigned int high, low

high = (PeriodCnt*dc) / 100 //计算高电平所需的计数值

low = PeriodCnt - high //计算低电平所需的计数值

high = 65536 - high + 12 //计算高电平的定时器重载值并补偿中断延时

low = 65536 - low + 12 //计算低电平的定时器重载值并补偿中断延时

HighRH = (unsigned char)(high>>8)//高电平重载值拆分为高低字节

HighRL = (unsigned char)high

LowRH = (unsigned char)(low>>8) //低电平重载值拆分为高低字节

LowRL = (unsigned char)low

}

/* T0中断服务函数，产生PWM输出 */

void InterruptTimer0() interrupt 1

{

if (PWMOUT == 1) //当前输出为高电平时，装载低电平值并输出低电平

{

TH0 = LowRH

TL0 = LowRL

PWMOUT = 0

}

else //当前输出为低电平时，装载高电平值并输出高电平

{

TH0 = HighRH

TL0 = HighRL

PWMOUT = 1

}

}

/* T1中断服务函数，定时动态调整占空比 */

void InterruptTimer1() interrupt 3

{

static bit dir = 0

static unsigned char index = 0

unsigned char code table[13] = { //占空比调整表

5, 18, 30, 41, 51, 60, 68, 75, 81, 86, 90, 93, 95

}

TH1 = T1RH //重新加载T1重载值

TL1 = T1RL

AdjustDutyCycle(table[index])//调整PWM的占空比

if (dir == 0) //逐步增大占空比

{

index++

if (index >= 12)

{

dir = 1

}

}

else //逐步减小占空比

{

index--

if (index == 0)

{

dir = 0

}

}

}

初始化的引脚是弱上拉的，芯片内部有上啦电阻，会不会是P10脚外部电路影响了P10脚的电平啊？或者是不是程序把P13设为输入了，这样PWM是不生效的。

从数据手册抄下来的：PWM示例程序

void main（）

{

CCON=0

CL=0

CH=0

CMOD=0x02

CCAP0H=CCAP0L=0x80

CCAPM0=0x42

CCAP1H=CCAP1L=0x80

PCAPWM1=0x03

CCAPM1=0x42

CR=1

while(1)

}

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