Mono-chip computer (MCU) long-press reset circuit

Abstract

The invention discloses a mono-chip computer (MCU) long-press reset circuit, comprising a short-press indicating circuit and an MCU reset circuit, wherein the short-press indicating circuit comprises a resistor R1, a resistor R2, a resistor R3, a light-emitting diode (LED) D1 and a triode Q1; the MCU reset circuit comprises a triode Q2, and a resistor R4 and a resistor R5 which are connected with a base electrode of the triode Q2 and are parallel to each other; the resistor R4 is in ground connection, and the resistor R5 is connected with a power supply by a key; an emitting electrode of the triode Q2 is connected with an MCU ground terminal; a collecting electrode of the triode Q2 is connected with a power supply by a resistor R6, is connected with the resistor R2 by a resistor R7, and is connected with a capacitor C1 and a capacitor C2 respectively by a parallel circuit resistor R8 and a diode D2; the capacitor C1 and the capacitor C2 are connected with the MCU ground terminal; output ends of the parallel circuit resistor R8 and the diode D2 are connected with a reset (RST) pin of an MCU. The MCU long-press reset circuit can realize the reset for the MCU by pressing the key for a long time; the function of short-time key press and the function of long-time key press are reliably separated from each other, so that different tasks can be processed by pressing the same key for different time.

Description

technical field [0001] The invention relates to the technical field of MCU control, in particular to an MCU long-press reset circuit. Background technique [0002] The development of science and technology in today's society is changing with each passing day, and emerging technologies emerge in endlessly. Single-chip microcomputers (MCUs) were born in the late 1970s and are considered old technologies. The main reason is that the single-chip microcomputer has many advantages such as high integration, small size, high reliability, strong control function, low voltage, low power consumption, easy to produce portable products, excellent performance-price ratio and easy expansion, etc. Favored by the consumer electronics market. [0003] The use of the single-chip microcomputer is inseparable from the reset (RST). Many abnormalities such as program runaway, abnormal power failure, and program stuck need to reset the single-chip microcomputer, otherwise there will be situations ...

AI Technical Summary

Problems solved by technology

The commonly used reset circuit mostly uses the RST pin of the MCU to be directly pulled up or down to achieve the purpose of reset. In relatively simple occasions, the function can indeed be realized and fewer components are used. However, when the trigger signal is required When it is used to trigger other circuits and MCU two circuits at the same time, the control of a single circuit cannot be realized, because if the two functions are triggered by the same trigger source, the two actions occur at the same time, and it is impossible to control another circuit without triggering MCU reset is required, therefore, prior art needs to be improved

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