SLAU748B October 2017 – September 2018 MSP432E401Y
The Ethernet LaunchPad uses a 25-MHz crystal (Y1) to drive the main MSP432E401Y internal clock circuit. Most software examples use the internal PLL to multiply this clock to higher frequencies up to 120 MHz for core and peripheral timing. The 25-MHz crystal is required when using the integrated Ethernet MAC and PHY.
The Hibernation module is clocked from an external 32.768-kHz crystal (Y3).