帮朋友写的一个用MCS-51的IO口模拟PWM使外接LED亮度渐变的程序，虽然程序小，不过注释清楚，并已调试OK。-written for a friend with a MCS-51 simulation of the IO mouth so that external PWM LED brightness gradual process Although procedures for small, but clearly Notes, and debugging OK.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001590s ]
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:0.075951s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.000993s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001178s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.000969s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003167s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000912s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003765s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.025333s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001360s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 149690 [ RunTime:0.039684s ]
