The MAXQ3210 microcontroller can perform a variety of microprocessor supervision and support tasks, including power-on reset control, power sequencing, watchdog timeout, and input switch debouncing. Depending upon the application, the MAXQ3210 can also supply power to the microprocessor directly. This application note shows how the MAXQ3210 runs directly from a 9V battery, and how, with no external clock-crystal components, it performs several functions normally supplied by a microprocessor supervisor for low-speed applications.