Memory circuit and method of writing data to and reading data from memory circuit

A method of writing data to and reading data from a memory circuit, the memory circuit including first and second latch circuits, a data input circuit, and a write back circuit, a robustness against noise in the second latch circuit being more improved than that in the first latch circuit, the method of writing data to and reading data from the memory circuit comprising:

• writing a write data at a timing of a clock signal and retaining the write data in each of the first and second latch circuits by the data input circuit by setting the write enable signal to a state allowing the write data to be written and by setting the clock signal to a state to write data, the write data having been input in each of the first and second latch circuits;
• and
• writing the write data retained in the second latch circuit to the first latch circuit by the write back circuit by setting the write enable signal to a state preventing the write data from being written and by setting the clock signal to the state to write data.