0- PL_SYS_MODE_RELEASE: debugging is not possible, application execution starts immediately after device powers up. Severe errors such as "divizion by zero" are ignored and do not stop execution.
1- PL_SYS_MODE_DEBUG: debug mode in which it is possible to cross-debug the application (under the control of TIDE software). Application execution is not started automatically after the power up. Severe errors such as "divizion by zero" halt execution.