关于c8051f120输出一个时钟信号
#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? main里加这句试试
SFRPAGE = CONFIG_PAGE;
firewind 发表于 2012-5-18 16:15 static/image/common/back.gif
main里加这句试试
SFRPAGE = CONFIG_PAGE;
如果没记错的话,P0口是无寄存器分页的,即寄存器页通用
推荐楼主使用configration wizard 2这个软件,将MCU的启动代码配置出来。 建议仿真运行,看看程序是不是停留在晶振配置程序里了! 每次都需要在程序下载到板子之前,对板子进行断电复位,结果就可以正确显示了!但如果用板子上的复位按键却不起作用,这个是为什么啊?
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