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doubts in datasheet PIC24H

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while reading reference manual i came across Status register there are three bits SA,SB,SAB. and written
bit 13 SA: Accumulator A Saturation ‘Sticky’ Status bit(1)
1 = Accumulator A is saturated or has been saturated at some time
0 = Accumulator A is not saturated

bit 12 SB: Accumulator B Saturation ‘Sticky’ Status bit(2)
1 = Accumulator B is saturated or has been saturated at some time
0 = Accumulator B is not saturated

bit 11 OAB: OA || OB Combined Accumulator Overflow Status bit
1 = Accumulators A or B have overflowed
0 = Neither Accumulators A or B have overflowed
Click to expand...

Means what is saturation here?
These are the read and clear only bits. So what this bit indicates?
 

You may look at the "11.7 Saturation logic" section,
**broken link removed**
 
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Thank you
This is related to what?? In short.
 

This is related to what?? In short.
Click to expand...
Digital signal processing, e.g. filters. I think Fig. 11.6 in the linked document is about to self-explanatory.

The status bits can be used by a compiler to provide custom instructions or functions for arithmetic with saturation.
 

Thank you sir
Which compiler is used for PIC24h/dsPIC33F family.
XC16 or C18?
 

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