MICROCONTROLLER AND METHOD FOR MANUFACTURING THE SAME

摘要

A microcontroller which operates in a low power consumption mode is provided. A microcontroller includes a CPU, a memory, and a peripheral circuit such as a timer circuit. A register in the peripheral circuit is provided in an interface with a bus line. A power gate for controlling supply control is provided. The microcontroller can operate not only in a normal operation mode where all circuits are active, but also in a low power consumption mode where some of the circuits are active. A volatile memory and nonvolatile memory are provided in a register, such as a register of the CPU. Data in the volatile memory is backed up in the nonvolatile memory before the power supply is stopped. In the case where the operation mode returns to the normal mode, when power supply is started again, data in the nonvolatile memory is written back into the volatile memory.

主权项

1. A microcontroller comprising:
a CPU; a controller;
a timer circuit;a first register in the CPU;a second register electrically connected to the timer circuit; anda power gate configured to supply power to the CPU, the timer circuit, the first register and the second register, wherein the microcontroller is capable of being an operation mode,
wherein the operation mode includes at least:
a first mode, the first mode being a mode where the CPU, the timer circuit, the first register, the second register and the controller operate;a second mode, the second mode being a mode where the timer circuit, the second register and the controller operate; anda third mode, the third mode being a mode where the controller operates, wherein the microcontroller is configured to shift from the first mode to one of the second mode and the third mode by an instruction of the CPU, wherein the microcontroller is configured to shift from the second mode to the first mode by the controller in accordance with a first signal supplied from the timer circuit, wherein the microcontroller is configured to shift from the third mode to the first mode by the controller in accordance with a second signal supplied to the controller, and wherein the first register and the second register each comprises:
a first volatile memory; anda first nonvolatile memory comprising a first transistor, wherein a channel formation region of the first transistor comprises a first multilayer oxide semiconductor film.