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about nested interrupts!

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hi, whether 8051 mc supports nested interrupts? if yes, how? if no, why?
pls help me
thank u
 

Review the 8051 hardware manual, take particularly a look at interrupt priority feature.

In a short, interrupts can be nested once utilizing the two available priorities.
 

All the interrupts are latched and When 8051 enters into a ISR, then it will disable all the interrupt which are having priority level lower and equal than that. Low priority interrupt will be serviced after finishing the services of higher priority interrupts.

you have to manipulate Interrupt Priority control register for that.

check out following for details

Code: 
http://www.8052.com/tutint.phtml
 
yes 8051 supports to nested interrupts
 

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