Hi,

I changed e2prom. I'm using 24C01. I downloaded Keil free edition. I could see the interrupt working in simulator.

I put a single pin (P1.4) in low when the interrupt is called. I can see it in the Keil Simulator, but it doesn't work in the LPC.

#define M24C01 0x50	// 0101 0000

void main(void)
{
  P1M1 &= 0xEF;
  P1M1 |= 0x20;
  P1M2 &= 0xDF;
  P1M2 |= 0x10;

  P1 |= 0x10;
  i2c_init(0x00, 0);
  EA=1;
  while(1)
  {
    STA=1;
    i2c_transmit(M24C01);					// send peripherical address
    while(STA);// wait trans. to be completed (device address)
    STO=1;
  }
}

I put the P1.4=0 near the ISR end:

...
      break;
	 }
  // clear interrupt flag
  SI = 0;
  P1&= 0xEF;		// 1110 1111
} // i2c_isr

What's the problem ? Why the interrupt doesn't work ? The I2C interrupt is enable in i2c_init() and EA=1 in the main program. I don't know...

Jorge