?? delay.c
字號(hào):
#include <AT89X52.H>
#include <INTRINS.h>
/* Configure Timer 1
- Mode = 2
- Interuppt = DISABLED
- Clock Source = INTERNAL
- Enable Gating Control = DISABLED
*/
//delay function
void delay(unsigned int i){//i per 512us 6M crystalloid
TMOD &= 0x0F; // clear Timer 1 control
TMOD |= 0x20 ; //mode 2
if(i)
{
TL1 = 0x6 ; // 500us set by user
TH1 = 0x6 ;
}
else
{
TL1 = 0xCE ; //100us
TH1 = 0xCE ;
i=1;
}
TR1 = 1; // TCON.6 start timer
for(;i;i--)while(!_testbit_(TF1));
TR1=0; //stop timer
}
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