M2 Communication Inc.

Fabien Petitgrand

Huang-Lun Lin

A control module used with a peripheral unit having configuration information through a system bus includes a storage unit, a state machine unit and an event detector. The storage unit is configured to store a program. The state machine unit is configured to operate under the program. The event detector is configured to receive a hardware interrupt signal from the peripheral unit via an additional wire, wherein the event detector triggers the state machine to perform one of storing and retrieving the configuration information respectively to and from the storage unit via the system bus.

Control module for data retention and method of operating control module

A system having a first mode, a second mode and a system bus comprises a peripheral circuit, a power management unit (PMU), an additional wire and a control module. The peripheral circuit has a configuration information representing a circuit state thereof. The power management unit (PMU) generates an interrupt signal. The additional wire transmits therethrough the interrupt signal. The control module, in response to the interrupt signal, stores the configuration information via the system bus when the system is in the first mode and restores the configuration information via the system bus when the system is in the second mode.

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Hsinchu County, Taiwan

Fabien Petitgrand