Is it correct that the timing system inside the machine will stop working after the microcomputer is powered off?

Incorrect. There is a CMOS clock built into the machine's motherboard, which is a battery-powered chip (crystal oscillator). Even if the system is powered off, the CMOS clock can maintain the date and time. Because the CMOS clock is independent of the operating system, it is also called a hardware clock. It provides a timing standard for the entire computer and is the lowest-level clock data.

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

The timing system inside the machine will not stop working after the microcomputer is powered off.

There is a battery on the motherboard to provide power for CMOS to maintain settings and crystal oscillator power

The CMOS clock (also known as RTC) is a battery-powered clock on the motherboard Chip (crystal oscillator). RTC can maintain date and time even if the system loses power. Because it is independent of the operating system, it is also called a hardware clock. It provides a timing standard for the entire computer and is the lowest-level clock data.

Clock Error

The time error of the real-time clock chip mainly comes from the frequency error of the crystal oscillator in the clock chip, and the frequency error of the crystal oscillator is mainly caused by temperature changes. Therefore, effectively compensating the error caused by the temperature on the crystal resonant frequency is the key to improving the clock accuracy. The quartz crystal resonant frequency error compensation method is based on the known error in the crystal resonant frequency as the temperature changes. A method for accurately compensating a divider counter that generates a frequency of 1Hz.

The most important function of RTC is to provide the calendar function until 2099. For time, no matter how fast or slow it is, there is an error, and the matching capacitor plays a very important role in the peripheral devices of the RTC. It can properly Fixed the matching problem between crystal and RTC.

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