The MSP430 introduced the industry’s first zero-power Brown-Out Reset (BOR) protection. The screen shot shows a typical battery insertion and real example of brownout. The BOR forces a MCU into reset both on power-up, when VCC rises, and when VCC falls below the normal operating range, but not fully to ground. Because the MSP430 BOR is zero-power and fully active in all operating modes, the most reliable operation is ensured under all conditions.