Hi oleg, Thanks for your reply, and time you are spending sending replies.

Here is my configuration function I call this function only once from main at start up.

sfr IPH=0xb7;


/*Initializing the envoirment*/
void init_ios(void)
{
	ioport=0xf0;
	P3=0xff;

	FIREPORT=1;
	IE=0;
	
	RCAP2H=0xfa;			//ADC sampling 20 samples per cycle
	RCAP2L=0xca;
	T2CON=0x00;
	TMOD=0x21;				//Timer 0 in 16 bit timer 1 8 bit autoreload.
	TH1=0x7a;				//system timer ticks once 100us.
	TF1=0;
	IP=0x08;				//Timer 1 priority set.
	IPH=0x08;
	IE=0x00;
	EA=1;					//Enabling global interrupts.
	ET1=1;					//Enabling timer 1 interrupt.
	TR1=1;					//Start timer 1.
	IT0=1;					//Interrupt 0 level triggered.
	IE0=0x00;				//Clear External Interrupt 0 Flag.
}

Although the above function showed only timer 1 interrupt being enabled but in my program I am also using timer 0 and timer 2 interrpts but those interrupts are not always active. My main program actiavtes these interrupts as and when needed and disables them when not needed. Timer 2 in 16 bit auto reload mode is being used for readin ADC PCF8591 through soft I2C routine. and timer 0 is used for timeout of an user set interval upon this time out interval system stops the work and ask user what to do next? If needed tell me I will post those ISR's also. The important thing to note is that I am setting Highest interrupt priority of timer 1 interrupt synchronising the timer 1 values ever zero cross but still the thyristor output is flickering.

Thanks & Regards,
Prahlad Purohit