#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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