Electronic device, flash memory controller and method for performing garbage collection operation on flash memory module

摘要

A flash memory controller is configured to access a flash memory module, and the flash memory controller includes a read-only memory and a microprocessor. When the flash memory controller is powered on and performs an initialization operation, within a predetermined time range of the initialization operation, the microprocessor determines whether a number of spare blocks in the flash memory module is lower than a first threshold value to determine whether to perform a garbage collection operation. When an elapsed time since the flash memory controller is powered on exceeds the predetermined time range, the microprocessor determines whether a number of spare blocks in the flash memory module is lower than a second threshold to determine whether to perform another garbage collection operation, where the second threshold value is lower than the first threshold.