Semiconductor device from transferring programs from a ROM to an SRAM
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United States of America Patent
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Jul 19, 2022
Grant Date -
Apr 30, 2020
app pub date -
Sep 18, 2019
filing date -
Oct 24, 2018
priority date (Note) -
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Abstract
A semiconductor device capable of reducing electric power consumption while suppressing deterioration in reliability is provided. The semiconductor device includes a flash memory, a SRAM formed on a SOI substrate, oscillation circuits generating a signal of a first frequency and a signal of a second frequency lower than the first frequency, and a processor operating in synchronization with a system clock. The processor performs steps of turning on a power supply of the flash memory, lowering a threshold voltage of the SRAM, transferring a program from the flash memory to the SRAM by using the signal of the first frequency as the system clock, turning off the power supply of the flash memory, heightening the threshold voltage of the SRAM, and executing the program stored in the SRAM by using the signal of the second frequency as the system clock.
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