»ùÓÚµ¥Æ¬»ú¼¼ÊõµÄ²¨Ðη¢ÉúÆ÷²ÉÓõ¥Æ¬»úÉè¼Æ(Ò»)_µç×ÓÐÅÏ¢¹¤³Ì±ÏÒµÂÛÎÄ
·¢²¼Ê±¼ä£º
2015-03-12
À´Ô´£º
ÈË´ó¾¼ÃÂÛ̳
»ùÓÚµ¥Æ¬»ú¼¼ÊõµÄ²¨Ðη¢ÉúÆ÷²ÉÓõ¥Æ¬»úÉè¼Æ(Ò»)_µç×ÓÐÅÏ¢¹¤³Ì±ÏÒµÂÛÎÄ
Õª Òª
»ùÓÚµ¥Æ¬»ú¼¼ÊõµÄ²¨Ðη¢ÉúÆ÷²ÉÓõ¥Æ¬»úÉè¼Æ£¬ÓóÌÐò²úÉú²¨ÐΣ¬ÏȼÆËã»ú¹¹³É²¨ÐεĵãÊý¼°ÊýÖµ£¬´æµ½Ö¸¶¨µÄ´æ´¢Çø£¬ÔÙ¶ÁÈ¡Êý¾Ý£¬¾D/Aת»»¶¼Êä³ö²¨ÐΣ¬½øÐÐD/Aת»»ÊÇ£¬Êä³öÒ»¸öµãµÄʱ¼ä¼ä¸ôÐëСÓÚD/Aת»»ËùÐèʱ¼ä¡£
¹Ø¼ü´Ê£ºµ¥Æ¬»ú ²¨Ðη¢ÉúÆ÷ D/Aת»»Æ÷
Abstract
The waveform generator of variable frequency power supply is designed in Microcontroller,the waveform of frequency power supply is created by using the program. The program procedure:first,the point nvmbers formed the waveform and their values are calculated,and save them to the appointed memory area.And then read data,perform D/Aconversions and outpot waveform.When then generator outputs data and performs D/Aconversions each time.
Keyword: Microcontroller; Waveform generator; DAC£»
1 ÒýÑÔ
²¨Ðη¢ÉúÆ÷×÷Ϊ³£ÓõÄÐźÅÔ´£¬±»¹ã·ºÓ¦ÓÃÓÚµ÷ÊÔ,×Ô¶¯¿ØÖÆϵͳºÍ½ÌѧʵÑéµÈÁìÓò¡£Ä¿Ç°Ê¹ÓõIJ¨Ðη¢ÉúÆ÷´ó²¿·Ö¶Ô´óµÄȱµãÊÇ£¬ÆäÌå»ý´ó£¬¿É¿¿ÐԲ¾«¶ÈµÍ¡£Ìá³öÒ»ÖÖÐԼ۱ȸߵIJ¨Ðη¢ÉúÆ÷£¬ÀûÓõ¥Æ¬»ú½øÐк¯Êý´¦Àí£¬ÓÉÈí¼þ¿ØÖƲ¨ÐÎÊä³ö£¬ÀûÓõ¥Æ¬»ú½øÐк¯Êý´¦Àí£¬ÓÉÈí¼þʵÏÖ²¨ÐÎÉú³É£¬Êä³öµÄÊý×ÖÐźÅÔپģÄâºÍÐźŷŴó´¦ÀíºóÊä³öËùÐ貨ÐΡ£¸Ã²¨Ðη¢ÉúÆ÷¾ßÓм¯³É¶È¸ß£¬Ìå»ýС£¬¿É¿¿ÐԺ㬾«¶È¸ß£¬¼Û¸ñ±ãÒ˵ÈÌص㡣
2 Éè¼ÆÈÎÎñºÍ»ù±¾ÒªÇó
2.1 ¾ßÓвúÉúÕýÏÒ²¨.·½²¨.Èý½Ç²¨ÈýÖÖÖÜÆÚÐÔ²¨ÐεŦÄÜ¡£
2.2 ÊäÈ벨ÐεÄƵÂÊ·¶Î§Îª100~~20khz£¨·ÇÕýÏÒ²¨ÆµÂÊ°´10´Îб²¨¼Æ
Ë㣩£»Öظ´ÆµÂʿɵ÷£¬ÆµÂʲ½½ø¼ä¸ôСÓÚ100HZ¡£
2.3 ¾ßÓÐÏÔʾÊä³ö²¨ÐεÄÀàÐÍ£¬Öظ´ÆµÂÊ£¨ÖÜÆÚ£©ºÍ·ù¶ÈµÄ¹¦ÄÜ¡£
3 ÔªÆ÷¼þÐÔÄÜ·ÖÎö
3.1 89C51´¦ÀíÆ÷µÄ»ù±¾½éÉܼ°ÆäÌصã
89C51Âß¼·ûºÅͼ
ͼ£¨1£©
89C51Ϊ40Òý½Å£¬ÆäÒý½ÅͼÈçͼ£¨1£©
CPUΪIntel¹«Ë¾Éú²úµÄ89C51/89C52/89C55µÈ¡£³ö³§ËùÅ侧ÕñƵÂÊΪ12MHZ,ÿ¸ö»úÆ÷ÖÜÆÚΪ1.085us,Óû§¿É¸ü»»¾§ÕñÒÔÌá¸ßËٶȡ£¡ñ³ÌÐò´æÖüÆ÷Ϊ64K,ÆäÖÐÇ°4K/8K20KÔÚCPUÄÚ²¿,ÆäËü³ÌÐòÔÚEPR0M27512ÖС£¡ñÊý¾Ý´æÖüÆ÷Ϊ32K(62256),µØַΪ8000¡ªFFFFH¡£¡ñ¢ñ/OÀ©Õ¹8155,ƬÄÚRAMµØÖ·¡Ã200O-20FFH8155,ÃüÁî¿ÚµØַΪ¡Ã2100HA¿ÚµØַΪ¡Ã21O1HB¿ÚµØַΪ.2102HC¿ÚµØַΪ:2103HTµÍ°Ëλ¡Ã2104HT¸ß°Ëλ¡Ã2105H¡ñA/D²ÉÓþ«¸ß¶È,Ëٶȿì(25us)µÄAD574,²¢ÔÚÆäת»»Ç°¶ÔÐźÅ×÷Á˲ÉÑù±£³Ö´¦Àí¡£AD574Æô¶¯µØַΪ:4000H¸ß°ËλµØַΪ¡Ã4002HµÍËÄλµØַΪ¡Ã4003H¶à·ģÄ⿪¹ØµÄʹÓáÃIN0¡ÃP1=0F8H IN4¡ÃP1=0FCHIN1¡ÃP1=0F9H IN5:P1=OFDHIN2¡ÃP1=0FAH IN5:P1=0FEHIN3¡ÃP1=0FBH IN7:P1=0FFHP1.0°´CD4051µÄC¢Í,P1.1°´CD4051µÄB½Å(10)¡¢P1.2°´CD4051µÄA½Å(11)¡£¡ñD/A²ÉÓÃ0832Êä³ö,µØַΪ¡Ã6000H-6FFFH¡ñ¼üÅÌÏÔʾ(CZ2)²ÉÓÃ8279,µØַΪ:7FFEH-7FFFH¡ñÈÕÀúʱÖÓоƬDS12887,ÃüÁî¼Ä´æÆ÷Ϊ5000H-500DH,²»µôµçÊý¾Ý´æÖüÆ÷Ϊ¡Ã500EH-507FH [M] 89C51Ö´ÐÐÖ¸ÁîµÄʱ¼äÓë¼°¶¨Ê±Æ÷/¼ÆÊýÆ÷¼ÆÊýµÄƵÂʶ¼ÓëÕñµ´Ô´µÄÖÜÆÚÓйأ¬ÎªÁËÌá¸ß²¨ÐÎƵÂʵľ«¶È£¬²ÉÓÃ12MHZµÄ¾§ÕñÓëÍⲿʱÖÓ·½Ê½£¬¾§ÕñµÄÁ½¸ùÒý½Å·Ö±ðÓë89C51µÄÍâ½Ó¾§ÕñÒý½ÅX1ºÍX2ÏàÁ¬¡£²¨Ðη¢ÉúÆ÷¹¤×÷ʱ£¬ÒªÇó½øÈ븴λ¹¤×÷״̬£¬Òò´ËÐèÉè¼Æ׼ȷ£¬¿É¿¿µÄ¸´Î»µç·¡£
89C51µ¥Æ¬»úÄÚ²¿ÉèÖÃÁ½¸ö16λ¿É±à³ÌµÄ¶¨Ê±Æ÷/¼ÆÊýÆ÷T0ºÍT1£¬ËüÃǾßÓмÆÊýÆ÷·½Ê½ºÍ¶¨Ê±Æ÷·½Ê½Á½ÖÖ¹¤×÷·½Ê½¼°4ÖÖ¹¤×÷ģʽ¡£ÔÚ²¨Ðη¢ÉúÆ÷ÖУ¬½«Æä×ö¶¨Ê±Æ÷ʹÓã¬ÓÃËüÀ´¾«È·µØÈ·¶¨²¨ÐεÄÁ½¸ö²ÉÑùµãÊä³öÖ®¼äµÄÑÓ³Ùʱ¼ä¡£Ä£Ê½1²ÉÓõÄÊÇ16λ¼ÆÊýÆ÷£¬µ±T0»òT1±»ÔÊÐí¼ÇÊýºó£¬´Ó³õÖµ¿ªÊ¼¼Ó1¼ÇÊý£¬×î¸ßλ²úÉúÒ洦ʱÏòCPUÇëÇóÖжϡ£Òò´ËÒªÏëÈ·¶¨¾«È·µÄʱ¼ä£¬Ê×ÏÈÒª¼ÆËã³ö¼ÇÊý³õÖµ¡£ÖжÏϵͳÊÇʹ´¦ÀíÆ÷¾ßÓжÔÍâ½çÒ첽ʼþµÄ´¦ÀíÄÜÁ¦¶øÉèÖõġ£µ±ÖÐÑë´¦ÀíÆ÷CPUÕýÔÚ´¦Àíij¼þʵÄʱºòÍâ½ç·¢ÉúÁ˽ô¼±Ê¼þ¡£ÔÚ²¨Ðη¢ÉúÆ÷ÖУ¬Ö»Óõ½Æ¬ÄÚ¶¨Ê±Æ÷/¼ÆÊýÆ÷Òæ³öʱ²úÉúµÄÖжÏÇëÇ󣬼ÈÊÇÔÚ89C51Êä³öÒ»¸ö²¨ÐβÉÑùµãÐźź󣬽Ó×ÅÆô¶¯¶¨Ê±Æ÷£¬ÔÚ¶¨Ê±Æ÷δ²úÉúÖжÏ֮ǰ£¬89C51µÈ´ý£¬Ö±µ½¶¨Ê±Æ÷¼Æʱ½áÊø£¬²úÉúÖжÏÇëÇó£¬89C51ÏìÓ¦Öжϣ¬½Ó×ÅÊä³öÏÂÒ»¸ö²ÉÑùµãÐźţ¬Èç´ËÑ»·²úÉúËùÐèÒªµÄÐźŲ¨ÐΡ£
8279µÄ»ù±¾½éÉܼ°ÆäÌصã
3.2.1 8279µÄ»ù±¾½éÉÜ
8279µÄÂß¼·ûºÅ
£¨Í¼2£©
8279Ϊ40Òý½ÅоƬ£¬ÆäÒý½ÅͼΪͼ£¨2£©
8279ÊÇIntel¹«Ë¾Éú²úµÄͨÓÿɱà³Ì¼üÅ̺ÍÏÔʾÆ÷½Ó¿Úµç·оƬ¡£8279¿ÉÒÔʵÏÖ¶Ô¼üÅ̺ÍÏÔʾÆ÷µÄ×Ô¶¯É¨Ã裬ʶ±ð±ÕºÏ¼üµÄ¼üºÅ£¬Íê³ÉÏÔʾÆ÷¶¯Ì¬ÏÔʾ¡£´Ó¶ø´ó´ó½ÚÊ¡ÁËCPU´¦Àí¼üÅ̺ÍÏÔʾÆ÷µÄʱ¼ä£¬Ìá¸ßÁËCPUµÄ¹¤×÷ЧÂÊ¡£ÁíÍ⣬8279Ó뵥Ƭ»úµÄ