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Clock correction circuit and clock correction method

A clock correction and clock generation circuit technology, applied in electrical components, electrical pulse generation, electrical digital data processing, etc., can solve the problem that the clock accuracy does not meet the accuracy of the power meter market.

Active Publication Date: 2014-01-22
RENESAS ELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The accuracy of this clock does not meet the accuracy required by the power meter market

Method used

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  • Clock correction circuit and clock correction method
  • Clock correction circuit and clock correction method
  • Clock correction circuit and clock correction method

Examples

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Effect test

no. 1 example

[0037] The clock correction circuit according to the first embodiment of the present invention will be appropriately described below with reference to the drawings.

[0038]

[0039] First, an overview of electronic equipment mounted with the clock correction circuit according to the present embodiment will be explained. figure 2 is a diagram showing an overview of a power meter as an example of electronic equipment mounted with the clock correction circuit according to the present embodiment.

[0040] The power meter device 1 includes: MCU (micro control unit) 10; measurement object unit 20; measurement LSI (large scale integration) 30; LCD (liquid crystal display) panel 40; EEPROM 50; and various external interfaces (card IC51, IrDA IC54, RS485IC55, PLC modem 56). In addition, the external interface card IC 51 can be connected to various card devices such as an IC card 52 and an ESAM 53 .

[0041] The measurement object unit 20 internally includes current detection sensor...

example 2

[0147] Figure 15 is a block diagram showing configurations of the clock correction circuit 100 and the MCU 10 that calculate correction to be supplied to the operation clock generation circuit 110 using the frequency error detector ( 3 ).

[0148] The MCU 10 is equipped with a reference oscillator 230 . The reference oscillator 230 generates a reference frequency higher than the frequency of the basic clock (a) using a TCXO or the like. The frequency of the reference clock oscillator is, for example, 14.4 MHz or 24 MHz. The reference oscillator 230 supplies the generated reference clock to the frequency error detector 170 and the correction clock generation circuit 120 as the second clock (h). Here, although the reference clock 230 can generate a more accurate clock signal than the above-mentioned high-speed clock (the output clock signal generated by the high-speed embedded oscillator 220 ), the reference oscillator 230 consumes more power to generate the reference clock. ...

example 3

[0152] It is conceivable that MCU 10 includes clock recovery circuitry. Figure 17 is a block diagram showing another configuration example of the MCU 10 including a clock recovery circuit. The MCU 10 includes a clock recovery circuit 240 and a selector 250 .

[0153] In consideration of power consumption and an application using a clock signal output from the external terminal 160 , the selector 250 supplies one or the other of the reference clock and the high-speed clock to the correction clock generation circuit 120 as the second clock (h) .

[0154] The high-speed clock generated by the high-speed embedded oscillator 220 and the 1-pulse correction clock (k) generated by the correction clock generation circuit 120 are supplied to the clock recovery circuit 240 . The clock recovery circuit 240 measures the frequency of the high-speed clock using the 1-pulse correction clock (k), and uses the measurement result to perform trimming (capacity adjustment) of the high-speed emb...

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Abstract

The ivnentioin discloses a clock correction circuit and a clock correction method. An operation clock generation circuit performs a calculation on the basis of the frequency errors of a fundamental clock and the clock pulses of the fundamental clock, and generates an operation clock obtained by correcting the frequency errors at first intervals. A correction clock generation circuit converts a lower-bit value that is a value represented by the bits lower than the predefined bit used for judging the change of the state of the operation clock into a count number of the clock pulses of a second clock whose frequency is higher than that of the operation clock, generates a correction clock obtained by correcting the operation clock on the basis of a time required for counting the count number of the clock pulses and the clock pulses of the operation clock.

Description

[0001] Cross References to Related Applications [0002] The entire disclosure of Japanese Patent Application No. 2012-147814 filed on Jun. 29, 2012 including specification, drawings and abstract is incorporated herein by reference. technical field [0003] The present invention relates to a clock correction circuit and a clock correction method, and more particularly to a clock correction circuit and a clock correction method, for example, for a power meter or the like. Background technique [0004] Recently, RTCs (Real Time Clocks) have been widely used in many information devices. An example of an RTC installed is a power meter. The power meter calculates electricity charges and the like based on the time period measured by the RTC. Generally, a tuning-fork type crystal oscillator is used to generate the operation clock of the RTC, and the temperature characteristic of the frequency of the tuning-fork type crystal oscillator is expressed by a quadratic function having a...

Claims

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Application Information

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IPC IPC(8): G06F1/14
CPCH03K3/011G06F13/1689H03K5/156
Inventor 安川智规河合一庆
Owner RENESAS ELECTRONICS CORP
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