m able ▁bit ▁in ▁the ▁device ▁is ▁presented ▁with ▁a ▁logical ▁address ▁and ▁it ▁appears ▁as ▁a ▁part ▁of ▁a ▁byte ▁in ▁the ▁device ▁registers . ▁Then ▁programming ▁of ▁these ▁bits ▁can ▁be ▁achieved ▁by ▁reading ▁from ▁or ▁writing ▁to ▁these ▁device ▁registers . ▁Most ▁devices ▁have ▁at ▁least ▁these ▁two ▁device ▁registers : ▁ ▁Data ▁Register : ▁to ▁which ▁the ▁data ▁to ▁be ▁input / output ▁is ▁read ▁from / written ▁to ▁the ▁device . ▁ ▁Control / Status : ▁Which ▁selects / sh ows ▁the ▁mode ▁of ▁operation ▁of ▁the ▁device . ▁ ▁Category : Digital ▁registers <0x0A> </s> ▁Gr end on ▁and ▁D od ders hall ▁Wood s ▁are ▁a ▁ 6 7 . 1 ▁hect are ▁bi ological ▁Site ▁of ▁Special ▁Scient ific ▁Interest ▁in ▁Gr end on ▁Under wood ▁in ▁Buck ingham shire . ▁The ▁local ▁planning ▁authorities ▁are ▁A yles bury ▁V ale ▁District ▁Council ▁and ▁Buck ingham shire ▁County ▁Council . ▁ ▁The ▁site ▁is ▁broad le aved ▁o ak ▁wood land ▁on ▁north ▁Buck ingham shire ▁cl ay , ▁with ▁an ▁under store y ▁of ▁ha zel ▁and ▁black th orn . ▁Her bs ▁include ▁prim rose ▁and ▁wood ▁an em one , ▁and ▁small ▁streams ▁and ▁wide ▁r ides ▁provide ▁additional ▁habit ats . ▁The ▁woods ▁have ▁ 3 5 ▁but ter fly ▁species , ▁including ▁the ▁rare ▁black ▁ha irst re ak . ▁There ▁were ▁five ▁species ▁of ▁f rit ill ary , ▁but ▁some ▁have ▁not ▁been ▁seen ▁since ▁the ▁late ▁