Semiconductor integrated circuit and power supply control method therefor

Abstract

A semiconductor integrated circuit () comprising: a plurality of processing circuits () each including a notification units for outputting a notification signal according to the processing state of the own processing circuit; a plurality of power supply switch units (SW, SW, SW) for switching the connection states between the respective processing circuits and a power supply source; a power supply switch control circuit which is connected with the notification means (), stores power supply control information () including a plurality of connection statuses, and controls the connection states on the basis of the notification signals and the power supply control information; and a data bus (BS) and the like connecting each of the processing circuits and the power supply switch control circuit, wherein: at least two or more of the plurality of processing circuits update the power supply control information via the data bus and the like before outputting a notification signal; and the power supply switch control circuit accepts a notification signal outputted from any one of the plurality of processing circuits after the update, and accordingly controls the connection states of respective ones of the plurality of power supply switch units on the basis of the updated power supply control information.