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Q: 

polling based method 

 How the polling based method is supported by the processor??
 How many devices I can set for polling based and interrupt based mode??

 My understanding is:
 If poll interval of a device AA is 100ms. After every 100ms the processor polls(check
 the status of the device) that device and process it if required otherwise it
 will switch to other task (only after 100ms the processor will poll Aa device)

 Now, How this is implemented or supported by the processor?? (Sorry if my question is not clear).

 are timers used for implementing polling method?

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