Hi Erik I hope you read this message because I need some help. I need to create an Keypad Interrupt only when one (any) of two pins from port 0 are pulled high. This is what you wrote last time, but it is not working.

""The Keypad Interrupt function is intended primarily to allow a single interrupt to be generated when Port 0 is equal to or not equal to a certain pattern."

Thus if KBPATN 0x22
KBMASK = 0x22
KBCON = 2
0x22 int
0x00 no int
0x02 no int
0x20 no int

Thus if KBPATN 0x22
KBMASK = 0x00
KBCON = 0
0x22 int
0x00 no int
0x02 int
0x20 int

use what works and just ignore what you do not want in the ISR

Erik "
can be found at http://www.8052.com/forum/read.phtml?id=94196

This is what I have but it is not working...can you help me? It is not generating an interrupt when either pin is pulled high.
thank you

void keypad_init(void)  
{
	P0M1 |= 0x03;
  	P0M2 &= ~0x03;
	P0 = 0x00;
	KBPATN = 0x03  	
        KBCON = 0x00;	// pattern must not match
	//KBCON &= 0xFE;
	KBMASK = 0x00;	   	
	KBCON &= ~0x03;
	
  	IP1 &= 0xFD;			// set isr priority to 0
  	IP1H &= 0xFD;
	
  	EKBI = 1;			// enable keypad interrupt
}