Three C51 single-chip power-on reset delay circuit diagram

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The following delay reset circuits are formed by using the charging time of an external RC branch on the RST pin of the microcontroller. A typical reset circuit is shown in Figure (a), where the RC values ​​are provided in the original manual. Figure (b) is a simplified reset circuit, and Figure (c) adds a diode D to Figure (a) to facilitate the rapid discharge of capacitor C, in preparation for the next power-on reset delay. After a series of delays, the microcontroller begins to enter the normal program running state according to the operating frequency of the clock source.