You can use different interrupts at once safely by usng priorities and proper design. Remember that internal interrupts are maintained until serviced, external are not. Also a lower priority interrupt can be interrupted by a higher priority one, but not vice versa. Choose your priorities with care keeping these facts in mind, and keep the interrupt sub-routines as short as possible. You can thus easily ensure that no interrupt is lost.

Keeping the sub-routines short means using flags as Pranav suggested.

kundi