Multi Interrupt with PIC

Dear All,

How to do multi interrupt in Pic? any sample code are welcome. I want using usart, rb0, timer intterrupt in one time. Any idea will be aprreciated.

Thanks

Generally you sort it out with the interrupt flag register.

You check the various flags of the perifials you have enabled for interrupt. Something like this in your ISR to branch to the appropriate handler:

Well there are differences among PICs here.
In PIC16, all interrupts are the same priority. The processor jumps to the top of your ISR routine any time it's NOT already running the interrupt code and any enabled flag is set. It's up to you to write code to figure out which flag is set and how to handle it and return.
In PIC18, you can do that but there is also 2 interrupt priorities you MAY choose to use. The processor will jump to the higher priority interrupt handler even if the low priority interrupt handler is already running. The opposite is not true.
In dsPIC, there is a different interrupt vector for each interrupt source, so you have to write a separate handler task for each source. Also there are a lot of different interrupt priority levels (0-7 IIRC) you can assign.