3050311118 发表于 2011-6-3 12:24:32

STC12CXX的PWM模块 我程序设脉宽为0的时候 还有高点平脉冲输出？？？？附示波器显示波形图

http://cache.amobbs.com/bbs_upload782111/files_40/ourdev_645494P8BI92.jpg
(原文件名:图像1156.jpg)


#include <STC12C5410AD.H>
#define uchar unsigned char
#define uint unsigned int
sbit D1=P2^6;

unsigned char i;
/* volatile unsigned char code sin=
{
0x7F,0x87,0x8F,0x97,0x9F,0xA6,0xAE,0xB5,0xBC,0xC3,0xCA,0xD0,0xD6,0xDC,0xE1,0xE6
,0xEB,0xEF,0xF2,0xF6,0xF8,0xFA,0xFC,0xFD,0xFE,0xFE,0xFE,0xFD,0xFC,0xFA,0xF8,0xF6
,0xF2,0xEF,0xEB,0xE6,0xE1,0xDC,0xD6,0xD0,0xCA,0xC3,0xBC,0xB5,0xAE,0xA6,0x9F,0x97
,0x8F,0x87,0x7F,0x77,0x6F,0x67,0x5F,0x58,0x50,0x49,0x42,0x3B,0x34,0x2E,0x28,0x22
,0x1D,0x18,0x13,0x0F,0x0C,0x08,0x06,0x04,0x02,0x01,0x00,0x00,0x00,0x01,0x02,0x04
,0x06,0x08,0x0C,0x0F,0x13,0x18,0x1D,0x22,0x28,0x2E,0x34,0x3B,0x42,0x49,0x50,0x58
,0x5F,0x67,0x6F,0x77
};          */


void PCA(void)
{

        CMOD=0x02;
        CL=0x00;
        CH=0x00;
        CCAP0L=0xFF;
        CCAP0H=0xFF;
        CCAPM0=0x42;
        CR=1;
}

/*voidt0init()
{

    AUXR=0X00;
    TMOD=0x01;             //选择定数计数器0的工作方式为16位定时器
    TH0=0XFF; //赋初值，定时50ms
    TL0=0XFe;
    EA=1;                  //中断控制允许
    ET0=1;
    TR0=1;   
}

void time0() interrupt 1 //定时器0中断函数
{

    TH0=0XFF; //赋初值，定时50ms
    TL0=0XFe;
        D1=!D1;
for(i=0;i<100;i++)
        {
                  CCAP0L=sin;
                  CCAP0H=sin;
       
        }       
}                */
void main()
{
   // t0init();
        PCA();
    while(1);

}

xsh2005105326 发表于 2011-6-3 12:53:39

有些硬件本身就不支持吧，查查IC资料

2233223 发表于 2011-6-3 13:17:10

它的PWM实际是9位，老妖说过了。

ahuang227 发表于 2011-6-3 17:31:01

9位是怎么测试出来的啊？

chenyuqiu 发表于 2011-6-3 21:16:14

晕
PWM的极性问题
匹配的时候输出高电平还是低电平可以通过极性来设置的。

maoy008 发表于 2011-9-18 11:51:15

看下

yangbing2020 发表于 2013-10-5 17:43:31

强烈关注

jemmy 发表于 2013-10-5 20:02:22

输出0脉宽的时候把PWM关了，直接让它没有输出。
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