Singlechip and on-chip power-on reset circuit thereof

Abstract

The invention discloses a singlechip and an on-chip power-on reset circuit of the singlechip, wherein the on-chip power-on reset circuit of the singlechip comprises a power supply input end, a reset control end, a fast power-on reset module, a slow power-on reset module, a signal processing module and a digital delay module. According to the on-chip power-on reset circuit of the singlechip, disclosed by the invention, the signal processing module takes or handles on a fast power-on reset signal generated by the fast power-on reset module and a slow power-on reset signal generated by the slow power-on reset module to generate a reset control signal, and the reset control signal is output to the digital delay module for being delayed, therefore, a stable and correct reset control signal is obtained, the singlechip is prevented from being wrongly reset to influence normal working, and the work stability and reliability of the singlechip are improved; meanwhile, a reset function can be achieved without using a large capacitor, thus the design cost and power consumption of the singlechip are reduced, and the singlechip can be more effectively prevented from wrongly resetting under the condition that a power supply environment is rugged.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a single-chip microcomputer and its on-chip power-on reset circuit. Background technique [0002] In single-chip microcomputer applications, the power-on reset circuit is used to reset or set digital modules such as counters and registers in the digital system when the power is turned on or off, so the power-on reset circuit is required to have high reliability. Sex, and the problem that the digital system of the single-chip microcomputer cannot work normally due to false reset cannot occur. [0003] In the current on-chip power-on reset scheme of single-chip microcomputer, there are schemes to detect the rising edge of the power supply voltage or the power supply voltage value, or both the rising edge and the voltage value. Under the condition of interference, there are often upward and downward spikes or fast power-on or slow power-on of the power supply, etc., whi...

AI Technical Summary

Problems solved by technology

[0002] In single-chip microcomputer applications, the power-on reset circuit is used to reset or set digital modules such as counters and registers in the digital system when the power is turned on or off, so the power-on reset circuit is required to have high reliability. The digital system of the single-chip microcomputer cannot work normally due to false reset.

[0003] In the current on-chip power-on reset scheme of single-chip microcomputer, there are schemes for detecting the rising edge of the power supply voltage or the power supply voltage value, or both the rising edge and the voltage value. Under the condition of interference, there are often upward and downward peaks or the power supply is powered on quickly or slowly, etc., often generating false reset signals, affecting the normal operation of the single-chip microcomputer and its digital system

[0004] The existing power-on reset scheme usually adopts an analog integrated circuit scheme, such as an external power-on reset circuit. In order to realize the power-on reset function, an external power-on reset circuit composed of a large capacitor, a large resistor, and a triode is usually used. Or a separate reset chip, however this increases the cost and power consumption of the microcontroller

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