Semiconductor device preventing writing of prohibited set value to register

摘要

A semiconductor device includes a data hold circuit configured to acquire data from a data bus and hold the data therein in response to assertion of a write signal, a prohibited set value hold circuit configured to store a predetermined prohibited set value, and a comparison circuit coupled to the data hold circuit and the prohibited set value hold circuit, and configured to assert a prohibition signal in response to a match between the prohibited set value stored in the prohibited set value hold circuit and the data held in the data hold circuit, the assertion of the prohibition signal preventing the data from being written to a predetermined register.