A semiconductor device including a nonvolatile memory cell realizes enhancement of reliability and convenience. The semiconductor device includes a nonvolatile memory unit that includes plural overwritable memory cells (CL), and a control circuit that controls access to the nonvolatile memory unit. The control circuit allocates one physical address to a chain memory array CY in the nonvolatile memory unit, for example. The control circuit performs writing to a memory cell (for example, CL0) that is apart of the chain memory array CY according to a first write command with respect to the physical address, and performs writing to a memory cell (for example, CL1) that is another part thereof according to a second write command with respect to the physical address.