9.3.8 Configuration Mismatch Reset (CM)

To maintain the integrity of the stored configuration values, all device Configuration bits are loaded and implemented as a complementary set of bits. As the Configuration Words are being loaded, for each bit loaded as ‘1’, a complementary value of ‘0’ is stored into its corresponding background word location and vice versa. The bit pairs are compared every time the Configuration Words are loaded, including Sleep mode. During this comparison, if the Configuration bit values are not found opposite to each other, a configuration mismatch event is generated, which causes a device Reset.

If a device Reset occurs as a result of a CM Reset, the CM Status bit (RCON[9]) is set.