SEMICONDUCTOR DEVICE

A semiconductor device includes a counter configured to increment a counter value each predetermined time period, a register storing values including a first value and a second value that is smaller than the first value, and a comparator configured to compare the counter value with the stored values, output a first signal to an external device if the counter value is greater than the first value when an initialization command is received from the external device, and set a flag in the register if the counter value is greater than the second value and smaller than the first value when the initialization command is received.