Freescale Semiconductor, Inc.User’s Guide© 2014 Freescale Semiconductor, Inc.1 TWR-KV31F120MThe TWR-KV31F120M microcontroller module isdesigned to work in standalone mode or as part ofthe Freescale Tower system, a modular developmentplatform that enables rapid prototyping and toolreuse through reconfigurable hardware. Take yourdesign to the next level and begin constructing yourTower system today by visitingwww.freescale.com/tower for additional TowerSystem microcontroller modules and compatibleperipherals.Document Number: TWRKV31F120MUGRev. 0, 03/2014Contents1. TWR-KV31F120M . . . . . . . . . . . . . . . . . 12. Contents . . . . . . . . . . . . . . . . . . . . . . . . . . 23. TWR-KV31F120M features . . . . . . . . . . . 34. Get to know the TWR-KV31F120M . . . . 35. Reference documents . . . . . . . . . . . . . . . . 46. Hardware description . . . . . . . . . . . . . . . . 46.1.Microcontroller . . . . . . . . . . . . . . . . . . 56.2.Clocking . . . . . . . . . . . . . . . . . . . . . . . 66.3.System power . . . . . . . . . . . . . . . . . . . 66.4.Debug interface . . . . . . . . . . . . . . . . . 66.5.Accelerometer plus Magnetometer . . 76.6.Potentiometer, pushbuttons, and LEDs 86.7.General Purpose Tower Plug-in (TWRPI) socket87. TWR-KV31F120M jumper options and headers 98. Useful links . . . . . . . . . . . . . . . . . . . . . . . 119. Revision history . . . . . . . . . . . . . . . . . . . 12TWR-KV31F120M Tower ModuleUser’s Guide