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Circuit and method for activating downloading mode of micro control unit (MCU)

A technology of micro-control unit and circuit, applied in the field of communication, can solve the problem of not having automatic control and so on

Pending Publication Date: 2022-01-07
NUBIA TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to solve the problem that the current control micro-control unit MCU does not have the ability to automatically control it to enter the download mode, and needs manual control to allow it to enter the download mode. Mode circuits and methods

Method used

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  • Circuit and method for activating downloading mode of micro control unit (MCU)
  • Circuit and method for activating downloading mode of micro control unit (MCU)
  • Circuit and method for activating downloading mode of micro control unit (MCU)

Examples

Experimental program
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no. 1 example

[0038] figure 1 A schematic diagram of circuit composition for activating the MCU download mode provided by this embodiment, the circuit 100 includes: an activation unit 110, a power-on unit 120, and a power supply unit 130, and the activation unit 110 is activated with the download mode of the MCU. The pin position 150 is connected, and the power-on unit 120 is connected to the power-on pin position 160 of the MCU; the power supply unit 130 is used to provide the power-on working voltage for the MCU; when the download mode of the micro control unit MCU needs to be activated , input the download signal 140 into the activation unit 110 and the power-up unit 120; the activation unit 110 generates an activation signal according to the download signal 140 and applies it to the download mode activation pin 150; when the After the activation signal, the power-on unit 120 generates a power-on signal according to the download signal 140 and applies it to the power-on pin 160 , so that...

no. 2 example

[0057] This embodiment provides a method for activating the download mode of the micro control unit MCU, said method comprising a circuit comprising an activation unit, a power-on unit and a power supply unit; when the download mode of the micro control unit MCU needs to be activated, the download The signal is input to the activation unit and the power-on unit; the activation unit generates an activation signal according to the download signal and applies it to the download mode activation pin of the MCU; after the activation signal is generated, the upper The electric unit generates a power-on signal according to the download signal and applies it to the power-on pin, so that the power supply unit powers on the MCU and enters a download mode.

[0058] See image 3 , image 3 A basic flow chart of a method for activating the MCU download mode provided by this embodiment. The method for activating the MCU download mode of the micro control unit comprises the following steps:...

no. 3 example

[0070] In order to facilitate the understanding of the specific working process of a circuit for activating the MCU download mode provided by the embodiment of the present invention, this embodiment is based on the attached figure 2 The circuit structure of the circuit will explain the specific working process of the circuit.

[0071] When the MCU of the smart terminal needs to be downloaded, the USB interface of the smart terminal is plugged into a USB cable. When the smart terminal is plugged into the USB cable, VBUS on the USB cable presents a voltage of 5V. The 5V voltage of VBUS of the USB passes through the C3 capacitor so that the control electrode voltage of the NMOS transistor Q3 is quickly boosted to 5V. When the control electrode voltage of the NMOS transistor Q3 starts to conduct during the rising process, when the turn-on voltage reaches the turn-on threshold, it is completely turned on. So the UBOOT signal is a low level signal. Then the 5V voltage of VBUS of ...

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Abstract

The embodiment of the invention provides a circuit and a method for activating a downloading mode of a micro control unit (MCU). The circuit comprises an activation unit, a power-on unit and a power supply unit, when the downloading mode of the MCU needs to be activated, a downloading signal is input into the activation unit and the power-on unit; the activation unit generates an activation signal according to the downloading signal and applies the activation signal to the downloading mode activation pin; and after the activation signal is generated, the power-on unit generates a power-on signal according to the downloading signal and applies the power-on signal to the power-on pin position, so that the MCU is powered on and enters a downloading mode. The downloading signal enters the activation unit to generate an activation signal, the activation signal is applied to a downloading mode activation pin position, then the power-on unit generates a power-on signal according to the downloading signal to enable the MCU to be powered on, the MCU can smoothly enter the downloading mode after being powered on, and the MCU automatically enters the downloading mode, so that the problem that manual control is needed to activate the MCU to enter the downloading mode at present is solved.

Description

technical field [0001] The invention relates to the technical field of communication, and more specifically, to a circuit and a method for activating a download mode of a micro control unit MCU. Background technique [0002] The current electronic price tag is an electronic label that displays price information in supermarkets, convenience stores, pharmacies, etc. It is mainly placed on the shelf and can replace the electronic display device of the traditional paper price tag. Each electronic shelf label is connected to the computer database of the shopping mall through a wired or wireless network, and the latest commodity prices are displayed on the screen on the electronic shelf label. [0003] However, due to cost considerations, the micro-control unit (MicrocontrollerUnit; MCU) mounted on the current electronic price tag does not have the function of direct download. Every time it is necessary to perform a download operation on the micro-control unit MCU, the whole machi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F9/22G06F1/26
CPCG06F9/22G06F1/266
Inventor 蒋权
Owner NUBIA TECHNOLOGY CO LTD
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