Semiconductor device and driving method thereof

摘要

A semiconductor device which can consume less power and a method for driving the semiconductor device can be provided. The semiconductor device includes a processor including a control device and an arithmetic unit, a memory device, an input/output device, and a plurality of bus lines which is a path for transmitting and receiving instructions, addresses, or data between the processor and the memory device, or the processor and the input/output device. A first memory storing each piece of information over the bus line is connected to each of the bus lines, and a second memory storing a status flag relating to information over the bus line is connected to the control device.

主权项

1. A semiconductor device comprising:
a processor comprising a control device and an arithmetic unit; a plurality of bus lines electrically connected to the processor, each of the plurality of bus lines provided with a first memory comprising a first transistor comprising a first oxide semiconductor layer in which a channel region is formed; and a second memory electrically connected to the control device, wherein information being in one of the plurality of bus lines is stored in the first memory which is electrically connected to the one of the plurality of bus lines, and wherein a status flag relating to the information is stored in the second memory.