doubts in datasheet PIC24H

[ep.hobbyiest]

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

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

 

[ucanel]

You may look at the "11.7 Saturation logic" section,
**broken link removed**

 

[ep.hobbyiest]

Thank you
This is related to what?? In short.

 

[FvM]

This is related to what?? In short.

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.

 

[ep.hobbyiest]

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

 

[FvM]

XC16 or C30