Write an 8051 C program to toggle bits of P1 continuously with a 250 ms delay.
Solution:
#include <reg51.h>
void MSDelay(unsigned int);
void main(void) {
while(1) { //repeat forever
P1=0x55;
MSDelay(250); //time delay
P1=0xAA;
MSDelay(250) }}
Assume the program is tested for the DS89C420 with XTML=11.0592MHz.
90ns =1275 = 114750ns = 1ms
void MSDelay(unsigned int itime) {
unsigned int i,j;
for (i=0; i<itime; i++)
for (j=0; j<1275; j++); // 1ms delay
}
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Why do we take p1= 0*55 and p1 = 0*aa
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