| abstract |
The present invention provides a processor in which malfunction is suppressed and power consumption is reduced. Alternatively, a processor having improved processing speed and reduced power consumption is provided. Alternatively, a method of driving the processor is provided. In the power gating driving method, the processor performs a part of data backup concurrently with arithmetic processing, and performs a part of data recovery concurrently with arithmetic processing. By such a driving method, the power consumption is suddenly increased in the backup period and the recovery period of the data to prevent the instantaneous voltage drop from occurring, and the increase in the backup period and the recovery period of the data is suppressed. |