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void pwm_init(void){
// Setting PWM frequency = 4.90KHz at 8MHz OSC Freq
PR2 = 0x65;
T2CKPS1 = 0;
T2CKPS0 = 1; // Timer 2 prescale = 4.

CCPR1L = 0; // Duty...

#include <htc.h>

__CONFIG(1,0x0F24);
__CONFIG(2,0X0000);

#define _XTAL_FREQ 8000000 //using internal osc

#define UART_BAUD 9600

Start(){


char exit,key;


exit =1;


while(exit)

ooo.. so it is just a system file? tq... when the coding being written like that it look complicated.... thx again...

can i ask one more thing, why there are some coding use '!= ' what does it do?

#include d:\mc51\8051io.
h
#include d:\mc51\8051reg.

tq...