Microcomputer and control method thereof
AssigneeRenesas Electronics Corporation
InventorMegumi Fujii
Life of this patent
Estimating the term…
Abstract
A microcomputer according to the present invention includes: a CPU (Central Processing Unit) that has a plurality of modes including a usual operational mode and a STANDBY mode, a clock supply being stopped in the STANDBY mode; a clock generation circuit that generates a clock supplied to the CPU; and a control circuit that monitors a mode of the CPU, determines a mode to which the CPU should transit according to the mode of the CPU and a type of an interruption request to the CPU, and controls the clock generation circuit according to the determined mode.
Claims16
A microcomputer comprising:
- a CPU (Central Processing Unit) that has a plurality of modes including a usual operational mode and a STANDBY mode, a clock supply being stopped in the STANDBY mode;
- a clock generation circuit that generates a clock supplied to the CPU;
- and
- a control circuit that monitors a mode of the CPU, determines a mode to which the CPU should transit according to the mode of the CPU and a type of an interruption request to the CPU, and controls the clock generation circuit according to the determined mode.
A control method of a microcomputer that includes:
- a CPU (Central Processing Unit) that has a plurality of modes including a usual operational mode and a STANDBY mode, a clock supply being stopped in the STANDBY mode;
- a clock generation circuit that generates a clock supplied to the CPU;
- and a control circuit, the control method comprising:
- monitoring, by the control circuit, a mode of the CPU;
- determining, by the control circuit, a mode to which the CPU should transit according to the mode of the CPU and a type of an interruption request to the CPU;
- and
- controlling, by the control circuit, the clock generation circuit according to the determined mode.
Dependencies are inferred from the claim text.