单片机ＩＯ口不足，用此电路做的键盘电路和程序，就可以了
8条口线24按键的C51源程序 .rar-SCM IO insufficient use of this circuit keyboard circuit and procedures on the eight lines mouth of the 24 keys C51 source. rar
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001179s ]
SELECT `a`.`aid`,`a`.`title`,`a`.`create_time`,`m`.`username` FROM `jrk_downrecords` `a` INNER JOIN `jrk_member` `m` ON `a`.`uid`=`m`.`id` WHERE `a`.`status` = 1 GROUP BY `a`.`aid` ORDER BY `a`.`create_time` DESC LIMIT 10 [ RunTime:0.094612s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.000981s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001133s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.012280s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.011014s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.011339s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.006884s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.028891s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.019475s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 278516 [ RunTime:0.035307s ]
