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標(biāo)題: STC8A單片機輸出任意路(8路以內(nèi))同頻率同占空比不同相位的pwm波怎么實現(xiàn)啊? [打印本頁]

作者: yjx156 時間: 2022-10-26 22:11
標(biāo)題: STC8A單片機輸出任意路(8路以內(nèi))同頻率同占空比不同相位的pwm波怎么實現(xiàn)啊?
用定時器1查詢延時和中斷延時都試過了，示波器上顯示的都是相位一樣的PWM波。求大神指點。

PWM波是直接用STC8A帶的pwm寄存器生成的。代碼如下：

作者: hhh402 時間: 2022-10-27 09:56
STC8A增強型PWM可以自由設(shè)定高低電平位置。頻率必須相同，占空比和相位隨便調(diào)。
范例：
#include "reg51.h"
#include "intrins.h"

//測試工作頻率為11.0592MHz

sfr    P_SW2    = 0xba;
sfr    PWMCFG    = 0xf1;
sfr    PWMIF    = 0xf6;
sfr    PWMFDCR    = 0xf7;
sfr    PWMCR    = 0xfe;

#define PWMC          (*(unsigned int volatile xdata *)0xfff0)
#define PWMCKS       (*(unsigned char volatile xdata *)0xfff2)
#define TADCP          (*(unsigned int volatile xdata *)0xfff3)
#define PWM0T1       (*(unsigned int volatile xdata *)0xff00)
#define PWM0T2       (*(unsigned int volatile xdata *)0xff02)
#define PWM0CR       (*(unsigned char volatile xdata *)0xff04)
#define PWM0HLD       (*(unsigned char volatile xdata *)0xff05)
#define PWM1T1       (*(unsigned int volatile xdata *)0xff10)
#define PWM1T2       (*(unsigned int volatile xdata *)0xff12)
#define PWM1CR       (*(unsigned char volatile xdata *)0xff14)
#define PWM1HLD       (*(unsigned char volatile xdata *)0xff15)
#define PWM2T1       (*(unsigned int volatile xdata *)0xff20)
#define PWM2T2       (*(unsigned int volatile xdata *)0xff22)
#define PWM2CR       (*(unsigned char volatile xdata *)0xff24)
#define PWM2HLD       (*(unsigned char volatile xdata *)0xff25)
#define PWM3T1       (*(unsigned int volatile xdata *)0xff30)
#define PWM3T2       (*(unsigned int volatile xdata *)0xff32)
#define PWM3CR       (*(unsigned char volatile xdata *)0xff34)
#define PWM3HLD       (*(unsigned char volatile xdata *)0xff35)
#define PWM4T1       (*(unsigned int volatile xdata *)0xff40)
#define PWM4T2       (*(unsigned int volatile xdata *)0xff42)
#define PWM4CR       (*(unsigned char volatile xdata *)0xff44)
#define PWM4HLD       (*(unsigned char volatile xdata *)0xff45)
#define PWM5T1       (*(unsigned int volatile xdata *)0xff50)
#define PWM5T2       (*(unsigned int volatile xdata *)0xff52)
#define PWM5CR       (*(unsigned char volatile xdata *)0xff54)
#define PWM5HLD       (*(unsigned char volatile xdata *)0xff55)
#define PWM6T1       (*(unsigned int volatile xdata *)0xff60)
#define PWM6T2       (*(unsigned int volatile xdata *)0xff62)
#define PWM6CR       (*(unsigned char volatile xdata *)0xff64)
#define PWM6HLD       (*(unsigned char volatile xdata *)0xff65)
#define PWM7T1       (*(unsigned int volatile xdata *)0xff70)
#define PWM7T2       (*(unsigned int volatile xdata *)0xff72)
#define PWM7CR       (*(unsigned char volatile xdata *)0xff74)
#define PWM7HLD       (*(unsigned char volatile xdata *)0xff75)

void main()
{
P_SW2 = 0x80;
PWMCKS = 0x00;                            // PWM時鐘為系統(tǒng)時鐘
PWMC = 0x0800;                            //設(shè)置PWM周期為0800H個PWM時鐘
PWM0T1= 0x0100;                            //PWM0在計數(shù)值為100H地方輸出低電平
PWM0T2= 0x0700;                            //PWM0在計數(shù)值為700H地方輸出高電平
PWM1T2= 0x0080;                            //PWM1在計數(shù)值為0080H地方輸出高電平
PWM1T1= 0x0780;                            //PWM1在計數(shù)值為0780H地方輸出低電平
PWM0CR= 0x80;                            //使能PWM0輸出
PWM1CR= 0x80;                            //使能PWM1輸出
P_SW2 = 0x00;

PWMCR = 0x80;                            //啟動PWM模塊

while (1);
}
說明：PWM0,PWM1高低電平的位置是可以設(shè)置的，也就是相位，占空比可以隨意，但是頻率必須一樣。

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