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Smooth adjustment method for improving 1Hz clock precision and 1Hz clock system

A technology of smooth adjustment and time adjustment, applied in the direction of a single output arrangement, etc., to achieve the effect of eliminating accumulated errors and improving the accuracy of 1Hz clock

Active Publication Date: 2016-07-27
GIGADEVICE SEMICON (BEIJING) INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the present invention provides a smooth adjustment method and a 1Hz clock system to improve the accuracy of the 1Hz clock, the purpose of which is to solve the problem of cumulative errors caused by long-term direct use of the crystal oscillator clock and improve the accuracy of the 1Hz clock

Method used

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  • Smooth adjustment method for improving 1Hz clock precision and 1Hz clock system
  • Smooth adjustment method for improving 1Hz clock precision and 1Hz clock system
  • Smooth adjustment method for improving 1Hz clock precision and 1Hz clock system

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Experimental program
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Effect test

Embodiment 1

[0039] figure 1 A flow chart of the smooth adjustment method for improving the precision of the 1Hz clock provided by Embodiment 1 of the present invention is given, as shown in figure 1 As shown, the method includes the following steps:

[0040] Step 110, the adjustment enabling switch turns on the smoothing adjustment circuit, the amplitude adjustment circuit provides an adjustment amplitude signal to the smooth adjustment circuit, and the direction adjustment circuit provides an adjustment direction signal to the smooth adjustment circuit.

[0041] In this step, the user turns on the smoothing adjustment circuit by adjusting the enable switch, and according to the offset direction and offset degree of the crystal oscillator, sets the adjustment amplitude signal through the amplitude adjustment circuit, sets the adjustment direction signal through the direction adjustment circuit, and adjusts the amplitude signal and adjust the direction signal to the smooth adjustment circ...

Embodiment 2

[0050] Embodiment 2 provides a smooth adjustment method for improving the precision of a 1 Hz clock, the method includes the following steps:

[0051] Step 110, the adjustment enabling switch turns on the smoothing adjustment circuit, the amplitude adjustment circuit provides an adjustment amplitude signal to the smooth adjustment circuit, and the direction adjustment circuit provides an adjustment direction signal to the smooth adjustment circuit.

[0052] Wherein, the adjustment amplitude signal is the required adjustment value, indicating the offset degree of the asynchronous frequency-divided clock with the number of crystal oscillator pulses as the unit, and the adjustment direction signal is the increase or decrease signal of the number of crystal oscillator pulses, which is opposite to the offset direction of the crystal oscillator.

[0053] Step 120, within the adjustment time window, the smoothing adjustment circuit calculates according to the adjustment direction sign...

Embodiment 3

[0073] Figure 5 A structural block diagram of the 1 Hz clock system provided by Embodiment 3 of the present invention is given. The system adopts the smooth adjustment method for improving the accuracy of the 1 Hz clock in the above embodiment. Such as Figure 5 As shown, the system includes:

[0074] An adjustment enable switch 10 is used to open the smoothing adjustment circuit 13;

[0075] The amplitude adjustment circuit 11 is used to provide the adjustment amplitude signal to the smooth adjustment circuit 13;

[0076] The direction adjustment circuit 12 is used to provide an adjustment direction signal to the smooth adjustment circuit 13;

[0077] The smoothing adjustment circuit 13 is used for calculating according to the adjustment direction signal and the adjustment amplitude signal, to obtain the required number of the first subtraction pulse signal and the fixed number of the addition pulse signal, or to obtain the required number of the second subtraction pulse ...

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Abstract

The invention provides a smooth adjustment method for improving 1Hz clock precision and a 1Hz clock system. The method comprises the steps that an enable switch is adjusted to start a smooth adjustment circuit, wherein an amplitude adjustment circuit provides an adjustment amplitude signal for the smooth adjustment circuit, and a direction adjustment circuit provides an adjustment direction signal for the smooth adjustment circuit; in an adjustment time window, the smooth adjustment circuit carries out calculation according to the adjustment direction signal and the adjustment amplitude signal to acquire first minus pulse signals of a required number and plus pulse signals of a fixed number or acquire second minus pulse signals of the required number; and the smooth adjustment circuit outputs the first minus pulse signals and the plus pulse signals or the second minus pulse signals to an asynchronous frequency dividing circuit to adjust an asynchronous frequency dividing clock. According to the invention, the smooth adjustment circuit carries out forward or backward adjustment on the asynchronous frequency dividing clock, and thus a 1Hz clock is adjusted; the accumulation error of a crystal oscillator clock is eliminated; and the 1Hz clock accuracy is improved.

Description

technical field [0001] The invention belongs to the technical field of clock calibration and relates to a smooth adjustment method for improving the precision of a 1Hz clock and a 1Hz clock system. Background technique [0002] As a general-purpose microcontroller (MCU, MicroControlUnit), generally there will be an RTC (Real-timeClock, real-time clock) module inside for time-related functions. The external low-frequency crystal oscillator is provided. In order to reduce power consumption, a 1Hz clock is generated internally to drive quasi-static registers such as seconds, minutes, and hours. Therefore, the accuracy of the 1Hz clock is particularly important for long-term running time. [0003] At present, the driving clock used by the time and date related registers in the microcontroller is generally an external low-frequency crystal oscillator. After frequency division, it is connected to the CK terminal of the time and date related registers. Therefore, the accuracy of ti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K5/13
Inventor 刘洋李宝魁
Owner GIGADEVICE SEMICON (BEIJING) INC