With timer interrupt, single chip microcomputer interrupt processing time is greater than timer timing?

With timer interrupt, single chip microcomputer interrupt processing time is greater than timer timing?

If the interrupt type is different, it can be nested according to priority, if it is the same interrupt type (such as the title),
There are three kinds of results: 1, immediately into the new interrupt processing (interrupt nesting) 2, wait for the interrupt processing and then enter the new interrupt processing 3, error.

Single-chip processor interrupt processing time is greater than the timer time, at the next interrupt time, because the interrupt is the same type, the same priority, so will not immediately enter the new interrupt processing.
But at the end of this interrupt processing, the microcontroller immediately into the new timer interrupt function, the main function of the statement may not have the opportunity to run down, will affect the real-time of the subsequent interrupts. So the answer is 2.

If in order to avoid the interruption of nesting (the same priority does not occur), in the interrupt processing of the man in the interrupt when the interrupt, after processing the interrupt after the interruption, will affect the real-time of the subsequent interrupts.

The safest way to handle it: the shorter the interrupt processing time, the better, and what to do with the outside. The purpose of the interruption is to improve the real-time system, interrupt processing is too long, will affect the level of interrupt response, other interruptions talk about real-time.

Attached: Solve the problem of interrupt processing for high speed and large amount of data
1. In the interrupt, only receive. Or add a simple judgment. 2, in the main program processing.

With timer interrupt, single chip microcomputer interrupt processing time is greater than timer timing?