Physical unclonable function code generation apparatus and method thereof

A PUF code generation apparatus that includes a reference generator, a PUF information generation and storage array, a sensing amplifier and a writing driver is introduced. The PUF information generation and storage array includes a plurality of first memory cells each including a PUF information providing element and a PUF information storage element. The sensing amplifier compares a first electrical value read from the PUF information providing element to a reference generated from the reference generator to generate a PUF information. The writing driver performs a write-back operation on the PUF information storage element according to the PUF information. The sensing amplifier reads a second electrical value of the PUF information storage element to generate a sensing result and output a PUF code according to the sensing result.