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Fast Interruption

Hello!

I have configured PORT 2 to have eight fast interruptions. In Keil I can simulate them because I have created different buttons to simulate fast interruptions

define button "ppoAvisoAI",		"PORT2 |=0x0100"
define button "finAvisoAI",		"PORT2 &=0xFEFF"

So I can simulate the fast interruptions and all go on.

But my problem is the following:

I have connected my PC to my starter kit and I want to simulate the fast interruption, but I have problems.

My code id the following:

	while (1)
	{
		printf(menu);
		select=input();

		switch (select)
		{
			case '1': P2_P8=1; break;
			case '2': P2_P8=0; break;
			case '3': break;
		}
	}

So when P2_P8 = 1 is executed the fast interruption doesn't go on.

What can I do?