An information handling system includes a processor complex and a microcontroller unit (MCU). The processor complex includes a Real-Time Clock (RTC) function associated with a port of the processor complex, and that can be invoked on the processor complex by a call to the port. The MCU includes RTC logic to maintain time base information for the information handling system. When the RTC function is invoked, the processor complex traps the call to the port and redirects the call to the MCU. When the MCU receives the redirected call, the MCU invokes the RTC logic to respond to the redirected call and to provide the time base information to the processor complex.