External interrupt in 8051: help me out

[Rohi231]

Can anyone provide me reference for External interrupt for 8051. ?

 

[avineshb006@gmail.com]

HI Rohi
what u want to perform with the ext interrupt,
here the sample code is inserted for ur ref jus go through it

#include <REG52.H>

/*=============================================================================
=============================================================================*/
unsigned char ex0_isr_counter = 0;

void ex0_isr (void) interrupt 0
{
ex0_isr_counter++;   // Increment the count
}

/*=============================================================================
=============================================================================*/
void main (void)
{

/*-----------------------------------------------
Configure INT0 (external interrupt 0) to generate
an interrupt on the falling-edge of /INT0 (P3.2).
Enable the EX0 interrupt and then enable the
global interrupt flag.
-----------------------------------------------*/
IT0 = 1;   // Configure interrupt 0 for falling edge on /INT0 (P3.2)
EX0 = 1;   // Enable EX0 Interrupt
EA = 1;    // Enable Global Interrupt Flag

/*-----------------------------------------------
Wait forever.
-----------------------------------------------*/
while (1)
  {
  }
}

 

[dean_winchester]

what do u want to know.. like any specific requirements or any instance. ??

 

[Rohi231]

Hi avinesh & dean winchester. Thanks a lot for the code. It worked fine for me. I am trying to do gprs application. I am able to send the data from gprs modem to server through p89v51rd2. now i wanted to send the data from server to gprs. Here Gprs is connected to microcontroller through P3^6 and P3^7. (WR: external data memory write strobe P3.7 RD: external data memory read strobe P3.6). ( unfortunately for a reason i cant connect gprs to serial uart directly in this project). So just i wanted to know can i write any interrupt for P3.6 and P3.7? Help me out