The diagram shows the flow of production programming under normal circumstances.
Figure 1. Normal programming flow
While the diagram describes the normal programming flow for initial programming of new devices, the following factors may affect production programming:
- Access Port Protection (APPROTECT) was enabled by a previously programmed application on the device that needs to be overwritten for any reason. See APPROTECT and ERASEPROTECT are enabled for more information.
- System Protection Unit (SPU) memory protection was enabled by a previously programmed application on the device that may need to be overwritten or a different region of flash may need to be programmed while keeping the existing program unchanged. See Disabling SPU for more information.
- A Watchdog timer (WDT) was enabled by a previously programmed application on the device and may reset the device. See Reloading the watchdog timer for more information.