Tool/software: Code Composer Studio
During debugging with CCS, a phantom breakpoint stops execution at a NOP in mult16_f5hw.asm. However I am not executing any multiply at the time. This is occurring in a mature firmware project that I recently modified to run with MCLK = 16 MHz. Same code with MCLK = 8 MHz does not have this issue, which is exactly the problem reported in this post. and also here. Both of these posts were locked without resolution so I am reopening the question.
Similar to symptoms in the other problem report, the issue may be related to SPI in some way: I had code that failed with SPI peripheral access with MCLK = 16 MHz when using driverlib functions for SPI and clock initialization. My solution was to drop MCLK to 8 MHz and the code has been fine in the field. However if I simply increase MCLK to 16 MHz (after all SPI access is completed) , CCS consistently hits this phantom breakpoint at at a NOP in mult16_f5hw.asm.
I can provide more detail, but I am asking for help in with analyzing this issue.