I am working with MMA9553L. So far I was able to successfully configure various applications (e.g. AFE and pedometer) and read data from them. I am currently trying to configure the system to use the frame-based interrupt on pin INT_O but it is not working. I was able to configure the interrupt to be asserted after a mailbox command has been processed by sending 0b10000000 as a configuration byte to the MBOX configuration app, but sending 0b10100000 or 0b00100000 results in the INT_O pin staying low all the time. What should I do to enable the interrupt?