| 摘要 |
PROBLEM TO BE SOLVED: To prevent deterioration in security performance in a semiconductor device including a CPU and a coprocessor even when low power consumption is achieved by causing the CPU and the coprocessor to operate exclusively. ! SOLUTION: A semiconductor device comprises a CPU, a timer for generating a timer interrupt and a coprocessor. The coprocessor includes a computing unit, an arithmetic control circuit, a security circuit for protecting input/output data of the computing unit against attack from outside and a stop/start control circuit. When the timer interrupt is generated during execution of arithmetic processing by the coprocessor, the stop/start control circuit stops operations of the computing unit and the arithmetic control circuit while continuing an operation of the security circuit. ! COPYRIGHT: (C)2014,JPO&INPIT |
