关于c8051f120输出一个时钟信号

2020-02-05 09:21发布

  #include "c8051f120.h"

void Oscillator_Init()
{
int i = 0;
SFRPAGE = CONFIG_PAGE;
OSCICN = 0x83;
CCH0CN &= ~0x20;
SFRPAGE = LEGACY_PAGE;
FLSCL    = 0x90;
SFRPAGE = CONFIG_PAGE;
CCH0CN |= 0x20;
PLL0CN |= 0x01;
PLL0DIV = 0x01;
PLL0FLT = 0x21;
PLL0MUL = 0x02;
for (i = 0; i < 15; i++);  // Wait 5us for initialization
PLL0CN |= 0x02;
while ((PLL0CN & 0x10) == 0);
CLKSEL = 0x02;
}

void Port_IO_Init()
{
// P0.0  -  Unassigned,  Push-Pull,  Digital
// P0.1  -  Unassigned,  Push-Pull,  Digital
// P0.2  -  Unassigned,  Push-Pull,  Digital
// P0.3  -  Unassigned,  Push-Pull,  Digital
// P0.4  -  Unassigned,  Push-Pull,  Digital
// P0.5  -  Unassigned,  Push-Pull,  Digital
// P0.6  -  Unassigned,  Push-Pull,  Digital
// P0.7  -  Unassigned,  Push-Pull,  Digital

// P1.0  -  Unassigned,  Open-Drain, Digital
// P1.1  -  Unassigned,  Open-Drain, Digital
// P1.2  -  Unassigned,  Open-Drain, Digital
// P1.3  -  Unassigned,  Open-Drain, Digital
// P1.4  -  Unassigned,  Open-Drain, Digital
// P1.5  -  Unassigned,  Open-Drain, Digital
// P1.6  -  Unassigned,  Open-Drain, Digital
// P1.7  -  Unassigned,  Open-Drain, Digital

// P2.0  -  Unassigned,  Open-Drain, Digital
// P2.1  -  Unassigned,  Open-Drain, Digital
// P2.2  -  Unassigned,  Open-Drain, Digital
// P2.3  -  Unassigned,  Open-Drain, Digital
// P2.4  -  Unassigned,  Open-Drain, Digital
// P2.5  -  Unassigned,  Open-Drain, Digital
// P2.6  -  Unassigned,  Open-Drain, Digital
// P2.7  -  Unassigned,  Open-Drain, Digital

// P3.0  -  Unassigned,  Open-Drain, Digital
// P3.1  -  Unassigned,  Open-Drain, Digital
// P3.2  -  Unassigned,  Open-Drain, Digital
// P3.3  -  Unassigned,  Open-Drain, Digital
// P3.4  -  Unassigned,  Open-Drain, Digital
// P3.5  -  Unassigned,  Open-Drain, Digital
// P3.6  -  Unassigned,  Open-Drain, Digital
// P3.7  -  Unassigned,  Open-Drain, Digital

SFRPAGE = CONFIG_PAGE;
P0MDOUT = 0xFF;
XBR2    = 0x40;
}

void main()
{
int i;
WDTCN=0xde;
WDTCN=0xad;

  Oscillator_Init();
  Port_IO_Init();

  while(1)
{

LOOP:P0 = 0x0f;
      for(i=0;i<=1200;i++);
      P0 = 0x0f;
      for(i=0;i<=1200;i++);
goto LOOP;
}

}

这是我的代码，我想让P0口的引脚输出一个时钟信号，可是下载到板子后P0口的引脚输出一致时高电平，为什么？

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