Memory device to suspend ROM operation and a method of operating the memory device

A memory device, comprising:

• a read only memory (ROM) address controller configured to sequentially output a plurality of operation ROM addresses at which original ROM codes to be executed in response to an operation command are stored, and configured to suspend output of the plurality of operation ROM addresses in response to a suspend signal;
• a suspend signal generator configured to generate the suspend signal;
• and
• a register configured to, in response to an external command, store a time code indicating a preset period and store a ROM address code indicating a suspend ROM address,
• wherein the suspend signal is activated during the preset period, depending on whether the suspend ROM address is identical to an operation ROM address, among the plurality of operation ROM addresses, currently being output, and
• wherein the suspend ROM address is an address of a ROM code selected from among the original ROM codes according to whether execution is suspended.