> 2 External Inturrupts 8051

[BigJim]

Hiya guys, newbie here.

Is is possible to get a 8015 chip, with more than 2 external inturupts??

all help greatfully appriciated[sp?]

 

[Exo]

You could use external interrupt logic chip...
It raises an interrupt and then your interrupt routine will communicate to the logic chip to see wich interrupt was activated.

 

[Sherif Welsen]

You could use external interrupt logic chip...

May you provide us with more details about that chip please?

Thanks in advance.

 

[Exo]

Well, for example you could use a 74148 priority encoder IC

https://www.ralfzimmermann.de/ttl_ic/0e30.html

As you can see on this link it has an output E0 wich is low when none of the inputs are activated. If one or more of the inputs become activated, EO will become high, this line can be used to trigger your µC interrupt pin.

The 74148 will then encode the priority level of the interrupt into outputs A, B and C. So you can use these signals to see wich interrupt was activated.