1.4 Configuration Bits

The Configuration bits are stored in the User Configuration Ax and User Configuration B Flash memory areas. These bits can be programmed (= 0) or erased (= 1) to select various device configurations. There are two types of Configuration bits: system operation bits and code-protect bits. The system operation bits determine the power-on settings for system-level components, such as the Watchdog Timer. The code-protect bits prevent program memory from being read and written. Table 1-7 lists the Configuration Words of the dsPIC33AK512MC510 and dsPIC33AK512MPS512 family devices. Refer to the device data sheet for the full Configuration Word register descriptions.

In addition, both the two regions (in single boot) and the three regions (in dual boot) also have a backup copy. The configuration data are automatically loaded from the Flash Configuration Words to the proper Configuration Shadow registers during device Resets. The locations of the CFGA1, CFGA2 and CFGB registers and their backups are shown in Table 1-7. The primary and backup registers should be programmed at the same time or following the order described in Programming in Dual Partition Mode.