A long button reset circuit of a device microprocessor and its composite function method

Abstract

The invention discloses a long button reset circuit of a microprocessor for equipment and its compound function method. A charging and discharging circuit is added between the power key pin and the reset pin of the microprocessor, and the charging time is much longer than the discharging time. Features, through the judgment of the microprocessor, the multiple function multiplexing of the long button reset button is realized, which overcomes the problem that the traditional reset circuit set separately is prone to misoperation, and the reduced single reset button not only makes the device beautiful, but also facilitates the waterproofing of the device deal with. The present invention introduces the charging and discharging circuit into the solution, increases the reliability of reset, and avoids the influence of misoperation on the system. The present invention introduces the inverter chip into the scheme, which not only has high integration, but also adds the reminder function of loudspeaker and indicator light.

Description

technical field [0001] The present invention relates to the field of electronic circuits, in particular to a reset circuit of a device microprocessor and a compound function method thereof. It is a reset circuit that realizes a device with a built-in battery and no manual reset button, and solves the problem that current electronic devices encounter strong interference or When the system fails, it cannot actively resume normal operation. Background technique [0002] For integrated circuits such as ASIC and MCU, especially for digital integrated circuits, reset is one of the most important functions. Reset can initialize the circuit, so that the circuit can execute in the order of the designer's thought. If the reset circuit is not well designed, it may cause the circuit to enter an unknown state when the power is turned on or the power fluctuates, and the work will be chaotic. Although other measures can be taken in the circuit to remedy this erroneous state, such as soft...

AI Technical Summary

Problems solved by technology

like Figure 4 As shown, the BOR circuit can detect the power supply voltage very well, but the circuit is more complicated, such as Vref needs to be stable, a reference voltage circuit is required, the comparator needs the power supply to provide current, and the operating current is large, etc., from reducing cost and power consumption Considering other aspects, it is not a good solution. After the circuit starts to work normally, if it needs to be reset and restarted again, if the above-mentioned traditional circuit is used, it is not a good choice due to its defects.

Images