《日历时钟自动校准及调整.docVIP

日历时钟自动校准及调整 陈 勇，白艳梅，石新茂，丁 红 （烟台师范学院物理系，山东 烟台264025） 摘要：日历时钟时常跑快跑慢的现象普遍存在，经过日积月累，就会产生较大的误差。为了解决这一问题，我们设计了能够自动校准和调整运行速度的日历时钟。通过接收中央人民广播电台播出的中心频率为106.1MHz的调频信号，并解调出原来的音频调制信号，利用两个锁相环路分别跟踪800HZ和1600HZ的报时音频信号。锁相环路的输出引起单片机外部中断，中断程序排除干扰后完成对日历时钟的自动校准；并根据运行误差，对日历时钟芯片X1205内的数字微调寄存器和模拟微调寄存器进行微调补偿，实现其运行速度的自动调整。 关键词：日历时钟； 自动校准； X1205； TDA7010T 中图分类号：TP302 文献标识码：A Regulating and Adjusting automatically the Calendar Clock Chen Yong, Bai Yanmei, Shi Xinmao, Ding Hong. (The physical Department of Yantai Normal College, Shangdong Yantai 264025) Abstract: The phenomenon that the calendar clock runs sometimes fast and sometimes slow exists generally, and the error increases as time passes. In order to solve this problem, we designed a calendar clock which can automatically regulate and adjust its run rate. It receives the FM signal with the central frequency of 106.1 MHz, which is broadcasted by the Centre People Broadcasting Station, demodulates it and recovers the original audio frequency modulation signal, and uses two phase-locked loops to trace audio frequency pips at 800 Hz and 1600 Hz respectively. The output of the phase-locked loop induces an interrupt on the exterior of the MCU, after the interrupt service routine eliminated the interference, the automatic regulation on calendar clock is realized. According to the run error, the inching compensation is done to the digital trimming register and the analog trimming register on the X1205 chip of the calendar clock, and the automatic adjustment on its run rate is realized. Key words: Calendar clock； Automatic regulation； X1205 ； TDA7010T 1 概述 在各类检测控制系统中，需要通过日历时钟进行时间上的控制或对事件所发生的时间进行记录。如电网检测系统，路灯控制系统等。但日历时钟时常跑快跑慢的缺陷不可避免。经过日积月累，就会产生较大的误差，这会影响控制与检测的准确性。为了解决日历时钟的准确度问题，我们设计了能够自动校准和调整运行速度的日历时钟。它在每天的12：00和00：00都会自动校准一次，并根据12个小时运行的误差大小自动调整时钟的运行速度。可使时钟运行的准确度相当高。 我们设计的思路是：利用小型收音机中接收部分电路接收中央人民广播电台播出的中心频率为106.1MHz的调频信号，并解调出音频信号，将音频信号输入两个锁相环路。这两个锁相环路分别跟踪800Hz和1600Hz的报时信号。当接收到报时信号时，为单片机提供外部中断，通过执