A16B-3200-0042 隨著電子、電器類產(chǎn)品在社會生活中的普及，國內(nèi)眾多中小企業(yè)也紛紛開始自行研制，生產(chǎn)此類產(chǎn)品以滿足市場的需求，但由于中小企業(yè)人力、物力的局限，往往將主要經(jīng)歷放在了產(chǎn)品的生產(chǎn)上，而對于產(chǎn)品的出廠檢測卻不夠完善，造成產(chǎn)品返修率較高的局面，從實際情況來看，造成產(chǎn)生返修的故障中很大一部分是能夠在出廠檢測時被發(fā)現(xiàn)的，但是由于目前國內(nèi)的中小企業(yè)大部分依靠人工借助部分儀器，儀表來檢測，使得檢測效率低、測試面不廣，存在錯檢，誤檢等情況。
智能測試系統(tǒng)的引入可以很好地解決此類矛盾，幫助企業(yè)提高產(chǎn)品檢測的效率，下面將以一款機主機板的智能測試系統(tǒng)為例，全國闡述設(shè)計原理。
2 SST89E58RD2特性介紹
SST87E58RD2是一款80C51微控制器，包含32KB+8KB FLASH和256+768B的數(shù)據(jù)RAM。SST89E58RD2的典型特性是他的×2方式選項，利用該特性，設(shè)計者可使應(yīng)用程序以傳統(tǒng)的80C51時鐘頻率（每個機器周期包含12個時鐘）或×2方式（每個機器周期包含6個時鐘）的時鐘頻率運行。
FLASH程序存儲器支持傳統(tǒng)的并行編程，也支持串行在系統(tǒng)編程（ISP）。ISP允許在軟件控制下對成品中的器件進(jìn)行重復(fù)編程，SST89E58RD2也可采用在應(yīng)用中編程（IAP），允許隨時對兩片F(xiàn)LASH程序存儲器重新配置，即使應(yīng)用程序正在運行時也不例外。
SST89E58CD2特性如下：
80C51核心處理單元；
5V的工作電壓，操作頻率為0-40MHz；
64KB的片內(nèi)FLASH程序存儲器，具有ISP（在系統(tǒng)編程）和IAP（在應(yīng)用中編程）功能；
通過軟件或ISP選擇支持12時鐘（默認(rèn)）或6時鐘模式；
SPI（串行外圍接口）和增強型UART；
PCA（可編程計數(shù)器陣列），具有PWM和捕獲/比較功能；
3個16位定時器/計數(shù)器；
可編程看門狗定時器（WDT）；
10個中斷源，4個中斷優(yōu)先級；
2個DPTR寄存器；
低EMI方式（ALE禁能）；
兼容TTL和CMOS邏輯電平；
掉電檢測；
低功耗模式（掉電模式，外部中斷喚醒，空閑模式）。
3 智能測試系統(tǒng)原理
本智能測試系統(tǒng)以SST89E58RD2為核心，其原理框圖如圖1所示，包括：
SPI口線 主要用于向被測主板進(jìn)行程序下載和通訊；
I2C總線 向被測主板中的外部E2PROM讀取數(shù)據(jù)；
RS232電路 用于與上位計算機的通信；
外部FLASH 主要存放被測主板的程序目標(biāo)代碼，選用AT29C010A；
指示燈電路，每個故障點用一個指示燈指示，總數(shù)有32個，用4片74HC595做輸出驅(qū)動電路；
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