[51] 8051 based controller with more than two interrupts?

[hydr.ali]

Hi,

I am currently using AT89C2051 to measure the width of two PWM signals connected to two external interrupts (INT0 and INT1) available on pins P3.2 and P3.3 respectively. Now, I need to measure another PWM signal using external interrupt. I wanted to know whether there is some 8051 based CHEAP controller (preferably without ADC and with minimal pins like AT89C2051 which has 20 pins) which I can use? Or is there any way that I can increase the number of external interrupt handling capability of AT89C2051 (using some logic circuitry maybe?)

Thanks.

 

[ud23]

You can use another AT89C2051 which works as slave controller and sending data on UART to your master means your current AT89C2051 with two external interrupts

 

[hydr.ali]

You can use another AT89C2051 which works as slave controller and sending data on UART to your master means your current AT89C2051 with two external interrupts

Yeah, I think that would work for me. Can you please suggest some other 8051 family controller with more than two external interrupts so that I can use that single controller instead of one?

Thanks.

 

[arun_190175]

expend your interrupt by using or gates

 

[ud23]

you can search for 89s53 or silicon labs controllers but as per your requirements of 20 pins compatible is hard to find or may be I don't know the name of that part

 

[hydr.ali]

expend your interrupt by using or gates

@arun_190175, can you please explain how to expand an interrupt pin using logic gates?

Thanks.

 

[arun_190175]

you can manage one interrupt pin and one io port
i hope this will helps you

#include <REG2051.H>
void main()
{
	IT0=1;
	EX0=1;
	EA=1;
	P3=0xFF;
	while(1)
	{
		//do some thing
	}
}
void ISR_INT0() interrupt 0
{
	unsigned char a;
	a=P3|0x04|0x40;
	switch(a)
	{
		case (~0x02):
			P1=0x01;
		break;
		case (~0x80):
			P1=0x02;
		break;
		case (~0x20):
			P1=0x04;
		break;
		case (~0x10):
			P1=0x08;
		break;
		case (~0x08):
			P1=0x10;
		break;
		default :
			break;
	}
}