Regarding the J bit

Hi, 

I am using ARM Cortex R4F core and i want to know about the J bit in the CPSR/SPSR Field.

What is the purpose if this bit?

As per the Document, we can read the J bit value as 0. Is this condition is always true?

And if i want to enable this bit, How can i do that?

Can anyone please explain me this?

Regards,

Shivam Kakad 

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