The difference between real time interrupts and external one

[kannan]

Interrupt

Hi

what is the difference between real time interrupts and external interrupts

Thanks
G kannan

 

[IanP]

Re: Interrupt

Real time interrupt you will receive from "real time" sources such as Real Time Clock (example DS1337).
External intrrupt can be activated by any event such as keypad, keyboard, sensors. They will interrupt the micro at any random period of time, whereas the RTC intrrupt will occur periodically at the same time intervals ..

 

[eda4you]

Re: Interrupt

External interupts are driven by so called events => event driven

Is some critical applications it is necassary to guarantee that e.g. every 25ms a adc value is measured and put out after postprocessing, like for controller => time or real-time driven

 

[banh]

Interrupt

normally external interrupts are to be differentiated with internal interrupts.

an external interrupt comes from outside of the microC, for e.g. rising/falling edge at a pin

an internal interrupt is generated by the microC itself, for e.g. timer overflow interrupt.