Multiple power source-semiconductor integrated circuit

摘要

In a multiple power source semiconductor integrated circuit that is manufactured using a process which generates a large leakage current, supply of power to a function block that is not being used is stopped to reduce unnecessary power consumption. A multiple power source semiconductor integrated circuit ( 1 ) includes first to fourth function blocks ( 11 ) to ( 14 ) that are supplied with power from first to fourth power supply circuits ( 3 ) to ( 6 ), respectively, and a power supply control circuit ( 40 ) that controls supply of power by the first to fourth power supply circuits ( 3 ) to ( 6 ) under the control of a microcomputer as the first function block ( 11 ). The power supply control circuit ( 40 ) halts the supply of power to the first to fourth function blocks ( 11 ) to ( 14 ) when receiving prescribed data from the first function block ( 11 ), and restarts the supply of power when receiving a first or second interrupt signal ( 55 ) or ( 56 ) from outside.