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Hello everyone, today we will learn about the four major conditions of the RTC circuit

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in the standard timing of Intel's 10th to 12th generation low-power CPU chipsets

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This lesson includes two parts

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An introduction to the RTC circuit and an introduction to the four major working conditions of the RTC circuit

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First of all, low-power CPU refers to the integration of PCH and CPU, we collectively refer to it as CPU

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The RTC circuit is inside the PCH module

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The RTC circuit includes the RTC module inside the PCH, the RTC register,

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the external 32.768KHz crystal oscillator, and the reset of the RTC circuit

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RTC circuit is mainly used to store CMOS settings, save time, date and ESCD files

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If the RTC circuit is abnormal, the time and date information will be lost,

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and the CMOS setting information cannot be saved

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Abnormal RTC circuit will also cause failure to boot

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Let's take a look at the four working conditions of the RTC circuit

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The first one is VCCRTC

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This is a main power supply for the RTC module inside the CPU,

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the voltage value is 3.3V

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It is mainly used to save SMOS parameters and guarantee the normal operation of the time

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The second, RTCRST# and SRTCRST#, both are 3.3V high level

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These two are the reset of the RTC circuit, both of which are high at 3.3V

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The third is a 32.768KHz crystal oscillator

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This crystal oscillator is not shown in the standard timing diagram,

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but in the RTC circuit, it is an essential condition

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After the VCCRTC power supply is normal, the CPU will provide power to the crystal oscillator pin

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Then the crystal oscillator starts to vibrate, providing the reference clock for the RTC module inside the CPU

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Ok, this is an introduction to the four major conditions of the RTC circuit