Another similarity to the MSP430F5xx family, the FR57xx devices contain a robust power management module that includes supply voltage supervisors and an internal LDO. Unlike the 5xx devices, the FRAM devices only have one core voltage level of 1.5 V, the voltage at which FRAM is programmed. Some recommendations for this family of devices include putting a 470 nF capacitor on the Vcore pin; definitely not loading the Vcore pin internally, and definitely do not connect Vcore to other device pins. It must be a single connection from the power supply.