【正文】 position, use it, PC and a machine under the munication is very convenient, and ISD1420 chips, as a classic voice chip, it is very easy to use, simple control one of the least of system like the only by a microphone, a horn, two button, a power supply, a few resistance of capacitance. JAVA language is more popular programming language, its simple, efficient to get the general programming staff recognition. A digital clock in daily life is especially important, as a measure of time, he must be precise. This course is designed to, STC89C52 microcontroller, six for the digital tube, ISD1420 voice chip, horn, serial munication, JAVA language implementation with a PC tone, digital pipe display shows the time on the hour, a digital clock system. Key word: on the hour time, the serial munication, digital pipe display, digital clock. 目錄 I. 摘要 .................................................................................................................. 1 II. Abstract ............................................................................................................. 1 1. 設計要求及方案確定 ......................................................................................... 3 A. 設計要求 ........................................................................................................... 3 B. 方案確定 ........................................................................................................... 3 2. 硬件電路設計及描述 ......................................................................................... 4 A. 器件的型號和參數(shù) ............................................................................................ 4 1. 單片機的選擇 ........................................................................................... 4 2. STC89C52 的詳細資料 ............................................................................ 6 3. 時鐘的實現(xiàn) ............................................................................................... 7 4. LED 數(shù)碼管顯示模塊 .............................................................................. 8 5. 串口通信 ................................................................................................. 12 6. 整點報時 ................................................................................................. 14 B. 硬件整體電路圖 .............................................................................................. 17 3. 軟件設計 ......................................................................................................... 18 A. 主程序 ............................................................................................................. 18 B. 定時器 T0 中斷服務程序 ................................................................................. 19 C. 串口修改模塊 .................................................................................................. 20 D. 整點報時模塊 .................................................................................................. 21 E. 顯示模塊 ......................................................................................................... 22 F. 上位機模塊 ..................................................................................................... 23 G. 單片機程序源碼 .............................................................................................. 29 4. 小結 ................................................................................................................ 35 5. 參考文獻 ......................................................................................................... 36 1. 設計要求及方案確定 A. 設計要求 利用單片機設計制作具有下列功能的數(shù)字鐘： ① 自動計時，由 6 位 LED 顯示器顯示時、分和秒 ② 具備調整功能，可以直接由 PC 機通過串口調整數(shù)字鐘的時間； ③ 具備整點報時功能，報出當前的時間。單片機選用 STC89C52 即可；串口通信使用 MAX232 芯片，以及一個串行口，接通單片機的串行輸入輸出口；時鐘顯示模塊，由 6個 LED 數(shù)碼管，兩個 74HC573 芯片組成，分時復用單片機的 P1口；語音報時模塊，使用 ISD1420 語音芯片，喇叭，以及單片機的 P0口作為地址， P2 口的部分引腳作為控制位；內部定時器 T0作為數(shù)字鐘的信號產(chǎn)生源。單片機微型計算機簡稱單片機，特別適用于控制領域，故又稱為微控制器。因此，單片機只需要和適當?shù)能浖巴獠吭O備相結合，便可成為一個單片機控制系統(tǒng)。其發(fā)展趨勢不外乎以下幾個方面： 1) 多功能 單片機中盡可能地把所需要的存儲器和 I/O 口都集成在一塊芯片上，使得單片機可以實現(xiàn)更多的功能。 有的單片機針對某一個應用領域，集成了相關的控制設備，以減少應用系統(tǒng)的芯片數(shù)量。 2) 高效率和高性能