Memory storage device, memory controller and controlling method

A memory controller, for a memory storage device having a rewritable non-volatile memory module, the memory controller comprising:

• a host interface, configured to be coupled with a host system;
• a memory interface, configured to be coupled with the rewritable non-volatile memory module;
• and
• a memory management circuit, coupled to the host interface and the memory interface, and configured to receive a first signal and enter a power saving mode in response to the first signal,
• wherein the memory management circuit stops executing a command from the host system and stops giving a command to the rewritable non-volatile memory module in the power saving mode,
• wherein the rewritable non-volatile memory module is operated at a first working voltage, and the first signal is transmitted to the memory management circuit when the first working voltage is lower than a first voltage threshold,
• wherein the memory management circuit detects whether a reset signal is enabled, and the memory management circuit is unable to receive and execute a command from the host system when the reset signal is enabled,
• wherein if a circuit component working voltage is lower than a circuit component voltage threshold, the reset signal is enabled.

A controlling method for a memory storage device, comprising:

• disposing a rewritable non-volatile memory module in the memory storage device, and setting the rewritable non-volatile memory module to be operated at a first working voltage;
• detecting whether a first working voltage is lower than a first voltage threshold;
• detecting whether a circuit component working voltage is lower than a circuit component voltage threshold;
• setting the memory storage device to enter a power saving mode to stop executing a command from the host system and stop giving a command to the rewritable non-volatile memory module when the first working voltage is lower than the first voltage threshold;
• and
• enabling a reset signal stop receiving and executing a command from the host system when the circuit component working voltage is lower than the circuit component voltage threshold.