We use DesignStart Eval（AT421-MN-80001-r0p0-02rel0）for the first time.And we use only CORTEXM3INTEGRATIONDS module, and peripheral circuits of CM3 are own user-logic.
Even if in this case, is the number of free userable INTISR is 19 (from 45 to 63)?Or can use 64 (from 0 to 63)?
Hope this helps someone!
We are checking through unanswered questions and saw this one, I notice it is from two months ago.
Just to confirm 64 interrupts are supported.Interrupt 45-63 are free. Other interrupts have default connections