設(shè)計了基于GPS集成模塊和單片機最小系統(tǒng)的自動校時打鈴控制器。單片機通過對GPS集成模塊E531的串行口進行數(shù)據(jù)采集，得到實時格林威治時間，然后經(jīng)過時區(qū)調(diào)整轉(zhuǎn)換為標準北京時間。將其作為打鈴控制器的時間基準對系統(tǒng)本地時鐘DS1302進行校準。在GPS有效捕獲衛(wèi)星信號時可以及時得到標準時間，當(dāng)GPS模塊捕獲衛(wèi)星信號失效時可以通過本地時鐘繼續(xù)工作，這樣既保持了時間的準確性又保證了控制器工作的連續(xù)性。

　　Abstract:

　　Auto-timing ringing controller is designed based on GPS OEM module and SCM minimal system.MCU got the Greenwich time from E531 module.Then converted the time to Beijing time by adjusting the time zone. And the Beijing time calibrated the local chip DS1302. The controller based on the time of satellite when the GPS satellite signals received or the time of local chip when the GPS module can not receive satellite signals. In this way，it maintaines the accuracy of the controller’s time and ensures the continuity of it’s work.