hi I want to use ISD to debug my project based on ST uPSd 3233A, this chip has two UARTs, so I use one of them as ISD debuger, the other is used to comunicate with PC, but it is known that the program will be very slow (only one percent compared with no ISD)when ISD is enble, can my program receive the uart data or INT interrupt correctly in time? Is the ISD method used only in no any interrupt program? is it right? thanks!