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Functions of the different states of AT89S51 machine cycle

Howdy,

I am quite certain that getting any definitive answers is far fetched but trying my luck. 

The above figure describes the CPU timing information for a single machine cycle of the AT89 series from Microchip. I'm curious if any of the people here know at a very high level, what happens in states S2,S3,S5 and S6? 

Thanks