MCU, terminal and control method

Abstract

The invention discloses a MCU, a terminal and a control method. The MCU comprises an input selector, having an input end as a debug pin (Debug pin) of the MCU, a control end as a security mode (sec) control end of the MCU and a first output end, and being configured to enable the MCU to run normally but not be accessed through the input end and to enable only the input end to be connected with a debug module through the first output end; and the debug module, connected to a storage module, and configured to only control the storage to perform operations to erase and / or clear in a security mode. The technical scheme of the invention can achieve beneficial effects of simple operation process, small security risk and good user experience.

Description

technical field [0001] The present invention relates to the field of computer technology, in particular to an MCU, a terminal and a control method. Background technique [0002] A microprocessor (Microcontroller Unit, MCU), also known as a single-chip microcomputer (SingleChip Microcomputer) or a single-chip microcomputer, is to appropriately reduce the frequency and specifications of the central processing unit (Central Process Unit, CPU), and reduce the memory, Counter (Timer), USB, A / D conversion, Universal Asynchronous Receiver / Transmitter (UART), Programmable Logic Controller (PLC), Direct Memory Access (Direct Memory Access, DMA) and other peripheral interfaces, Even liquid crystal display (Liquid Crystal Display, LCD) drive circuits are integrated on a single chip to form a chip-level computer, which performs different combination controls for different applications. With the application of MCU more and more widely, it is particularly important to prevent the core pr...

AI Technical Summary

Problems solved by technology

[0003] Existing MCU manufacturers with security mode mainly protect codes stored in FLASH (FLASH Memory, flash memory) by not allowing the emulator to access the contents of FLASH, while other devices in the system CPU (Central Processing Unit, central processing unit), SRAM (static random access memory, static memory), etc. are relatively less protected or not protected, which brings hidden dangers to the security of the core code

[0004] In addition, when the system is in the safe mode, when the user or the system is converted to the normal mode, the existing MCU manufacturers need relatively complicated operations, and will leave the running records of the core program

[0005] In the existing technology, there are defects such as complicated operation process, large safety hazard and poor user experience

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