SLAU723A October 2017 – October 2018 MSP432E401Y , MSP432E411Y
The Hibernate clock is the clock source for the Tamper module. When an external oscillator is used and tamper is enabled, the external oscillator is monitored by the Tamper module. If the external oscillator stops for any reason, the XOSCFAIL bit is set in the HIBTPSTAT register and the Hibernate clock source is switched to the HIB LFIOSC immediately. When the XOSCST bit in the HIBTPSTAT register is 0, indicating the external oscillator is active, a 1 can be written to the XOSCFAIL bit to clear it and re-enable the external 32.768-kHz oscillator.
NOTE
Because the HIB LFIOSC has a wide frequency variation, it should not be configured as the HIB clock source when accurate monitoring of the tamper logs are important.