The features of the system control block of the F1680 Series device consist of Low-Voltage Detection (LVD), Voltage Brown-Out (VBO) detection, Power-On-Reset, a 16-bit Watchdog Timer, 17 to 37 GPIO pins with 5V tolerant, 4 to 8 LED drivers with programmable drive current from 3 mA to 20 mA, and an interrupt controller.