234.txt

来自「c80511f020实时时钟程序代码」· 文本 代码 · 共 42 行

#include "C8051F020.h" 

sbit P10 = P1^0; 
sbit P11 = P1^1; 

void SYS_Init (void); 
void Timer2_Delay (void); 

void SYS_Init (void) 
{ 
int i = 0; 

WDTCN = 0xDE; 
WDTCN = 0xAD; //关狗 

CKCON = 0x20; //定时器2时钟源为系统时钟 

P1MDOUT = 0x03; 
XBR2 = 0x40; //P1.0P1.1推挽。其他不动 

OSCXCN = 0x65; 
for (i = 0; i < 3000; i++); // Wait 1ms for initialization 
while ((OSCXCN & 0x80) == 0); 
OSCICN = 0x08; //启动外部晶振，内部晶振关闭 
} 

void Timer2_Delay (void)interrupt 4 using 1 
{ 
if(P11==0) //P1.0在P1.1为低时再翻转，整好1000us 
P10=~P10; 
P11=~P11; //P1.1每500us翻转一次， 
} 
void main (void) 
{ 
Init_Device(); 
RCAP2H= (65536-1000)/256; // 设置定时器T2 500us溢出 重装 
RCAP2L= (65536-1000)%256; 
TH2 = (65536-1000)/256; 
TL2 = (65536-1000)%256; 
TR2=1; 
while(1); 
}