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ADS1224 interface

Other Parts Discussed in Thread: ADS1224, HALCOGEN


I have to interface ADS1224 with RM48l90pge

I think to do this with spi2 pins which are sclk and somi pins for communication and cs0 and cs1 for mux controlling (behaves as IO pins)

to recive th data I use 3 data formats 

FMT0 as a 16 bits width recived data 

FMT1 as 9 bits data  for complete cycle 

and FMT2 of 2 bits for enable the callibration cycle 

I have two problems can I use the ISR

the ISR is configured for RXINT for ISR enable and spigetdata function for reading data in ISR mode

but when I use the function there is no RXINT ISR 

2.There is a way to recive an ISR on somi  pin when the falling edge from the ADS happened which tell me that there is new data ?

Or I have to use on of GIOA pins to recive the ISR ?