Semiconductor device, display system, and electronic device

A semiconductor device comprising:

• a controller;
• a frame memory;
• and
• a register,
• wherein the controller comprises a control circuit and a prediction circuit,
• wherein the frame memory comprises a memory device and a monitor circuit,
• wherein the register comprises a first memory circuit and a second memory circuit,
• wherein the second memory circuit comprises a transistor which includes a metal oxide in a channel formation region,
• wherein the prediction circuit is configured to predict the necessity of power supply to the register using a neural network and to output a first signal corresponding to a result of the prediction to the control circuit,
• wherein the control circuit is configured to save data stored in the first memory circuit to the second memory circuit on the basis of the first signal,
• wherein the monitor circuit is configured to output a second signal containing information on power consumption of the memory device to the prediction circuit, and
• wherein the prediction is performed using the second signal as input data.