Provided are an embedded micro computer unit (MCU) using a memory emulation module and a method of testing the embedded MCU. The embedded MCU includes an internal memory that is connected to bus master devices for storing temporary data of the bus master devices and a test vector in a test mode, a memory controller for accessing the internal memory or an external memory when a processor core is operated, and a memory emulation module that is connected between the memory controller and the internal memory for storing the test vector in the internal memory in the test mode.