pause and resume a key using microcontrollers

#include	<stdio.h>	  
#include	<string.h>

idata int hours_selected = 8; 		
idata int minutes_selected = 0;

idata int temp_hours_selected = 8;	
idata int temp_minutes_selected = 0;

idata unsigned char idata therapy_is_over;
unsigned int timer1_overflow_count = 0;
unsigned int timer0_overflow_count = 0;
idata unsigned char spill_over_count_loaded;
idata unsigned char spill_over_count1_loaded;

void timer1_ISR(void) interrupt 3
{
if(therapy_is_over == 0)
{
if(spill_over_count1_loaded == 1)
		{
			spill_over_count1_loaded = 0;
			timer1_overflow_count = 0;
//			minutes_remaining--;
			if((minutes_remaining == 0) && (hours_remaining == 0))
			{

	//				hours_remaining = hours_selected;
	//				minutes_remaining = minutes_selected;
					hours_remaining = 0;
					minutes_remaining = 0;
			}
			else
			{
				minutes_remaining--;
				if(minutes_remaining == -1)
				{
					minutes_remaining = 59;
					--hours_remaining;
				}
			}
			show_time_flag = 1;
		}
		else
		{
			if((timer1_overflow_count % 10) == 0)
				show_seconds_flag = 1;
			timer1_overflow_count++;
			if(timer1_overflow_count == 1220)
			{
				spill_over_count1_loaded = 1;
				TL1 = 0;
				TH1 = 0x4c;
			}
		}
	}
}