A semiconductor device includes a burst end signal generation circuit and an auto-pre-charge control circuit. The burst end signal generation circuit generates a write burst end signal based on a write flag and a latched burst mode signal in a first burst mode and generates the write burst end signal based on an internal write flag and an internal latched burst mode signal in a second burst mode. The auto-pre-charge control circuit performs an auto-pre-charge operation based on the write burst end signal.