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松翰SN8F5703单片机PWM例程IC解密

时间：2026-10-15 来源：芯片解密浏览：2次字号：大中小

//-----------------------------------------------------------------------------
// FILE: PWM3_Pulse.c
//-----------------------------------------------------------------------------
// IC解密
//
// The program is an example of PWM3 one pulse function to implement it.
//
// PW3 pulse decription:
// 1. when PW3EN = 1 ,
// PWM3 will output One Pulse PWM and than PW3EN to be 0
//
// The system clock frequency is IHRC 32MHz
//
// Device: SN8F5708
// Tool chain: KEIL C51 V9.50a
//
//-----------------------------------------------------------------------------
// Includes
//-----------------------------------------------------------------------------
#include <SN8F5703.h>
//-----------------------------------------------------------------------------
// Global Variables
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
// Function Prototypes
//-----------------------------------------------------------------------------
void PWM1PLS_Init(void);
//-----------------------------------------------------------------------------
// Main loop
//-----------------------------------------------------------------------------
void main(void)
{
CLKSEL = 0x06; // Fcpu = 32M/2 = 16M
CLKCMD = 0X69;
CKCON = 0X10; // From = 8M
WDTR = 0x5A; // clear watchdog if watchdog enable
P0 = 0;
P0M = 0;
P0UR = 0xFF;
P1 = 0;
P1M = 0xC0;
P1UR = 0xFF;
P2 = 0;
P2M = 0x3C;
P2UR = 0xFF;
PWM1PLS_Init(); // init PWM1
while (1)
{
WDTR = 0x5A; // clear watchdog if watchdog enable
}
}
//-----------------------------------------------------------------------------
// Function: void PWM1PLS_Init(void)
// Description:
// init PWM1 pulse
//
//-----------------------------------------------------------------------------
void PWM1PLS_Init(void)
{
PW1CH = 0x11;
PW1M |= 0x70; // PW1 rate is Fhosc/1 PWM输出频率危(32/1)/256 = 125KHZ PWM周期为8uS
PW1M |= 0x08; // enable PWM11 output (PWCH11)
PW1M |= 0x04; // enable PWM10 output (PWCH10)
// PW1M |= 0x01; // enable PW1 pulse output function (PW1PO)
PW1YH = 0x00;
PW1YL = 0xFF; // set PW1 cycle control 256
PW1DH = 0x00;
PW1DL = 0x3F; // set PWM duty control 64 占空比25％
// the dead band control : B point > A point (Must)
PW1BH = PW1DH;
PW1BL = PW1DL; // B point dead band control
PW1A = 0x00; // A point dead band control
PW1M |= 0x80; // Enable PWM output function (PW1EN)
}

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松翰SN8F5703单片机PWM例程IC解密

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