基于51單片機的酒精濃度測試儀設計（液晶）

基于51單片機的酒精濃度測試儀設計（液晶）,基于,51,單片機,酒精,濃度,測試儀,設計,液晶 *********學院 畢業(yè)設計（論文）任務書 學生姓名： 班級： 學號： 題目：基于51單片機的酒精報警器設計 內(nèi)容要求： 一、 任務 近設計時，考慮酒精濃度是由傳感器把非電量轉(zhuǎn)換為電量，傳感器輸出的是0-5伏的電壓值且電壓值穩(wěn)定，外部干擾小等。因此，可以直接把傳感器輸出電壓值經(jīng)過A/D轉(zhuǎn)換器轉(zhuǎn)換得到數(shù)據(jù)送入單片機進行處理。此外，還需接入液晶顯示，鍵盤設定，報警電路等。 其總體框圖如圖1所示。 被測 環(huán)境 氣敏 傳感器 A/D轉(zhuǎn)換電路 單片機 聲光報警電路 液晶顯示 鍵盤 圖1 基本工作原理圖 二、設計要求: （1）數(shù)據(jù)采集系統(tǒng)以單片機為控制核心，外圍電路帶有LCD顯示以及鍵盤響應電路，無需要其他計算機，用戶就可以與之進行交互工作，完成數(shù)據(jù)的采集、存儲、計算、分析等過程。 （2）系統(tǒng)具有低功耗、小型化、高性價比等特點。 （3）從便攜式的角度出發(fā)，系統(tǒng)成功使用了液晶顯示器以及小鍵盤。由單片機系統(tǒng)控制鍵盤和LCD顯示來實現(xiàn)人機交互操作，界面友好。 （4）軟件設計簡單易懂。 三、規(guī)定閱讀的文獻： （1）吳國經(jīng)?《單片機應用技術(shù)》?中國電力出版社??2004? （2）何希才《傳感器技術(shù)與應用》?北京航空航天大學出版社?2005.? （3）鄭學堅、周斌?《微型計算機原理及應用》?清華大學出版社?2006.? （4）周雪?《模擬電子技術(shù)(第二版)》?西安電子科技大學出版社?2005? （5）孫津平?《數(shù)字電子技術(shù)》?西安電子科技大學出版社?2005? （6）王幸之?《AT89?系列單片機原理與接口技術(shù)》?北京航空航天大學出版社?2004? （7）張文棟?《存儲測試系統(tǒng)的設計理論及其應用》?高等教育出版社?2001? （8）吳旗?《傳感器與自動檢測技術(shù)（第二版）》?高等教育出版社?2006? （9）周潤景?《基于Proteus的AVR單片機設計與仿真.》?北京航空航天大學出版社?2007? （10）馬中梅?《單片機的C語言程序設計（第四版）》?北京航空航天大學出版社?2007? （11）張道德?《.單片機接口技術(shù)（C51版）》?中國水利水電出版社?2007? （12）陳有卿?《通用集成電路應用與實例分析》?中國電力出版社?2007? （13）何希才?《常用集成電路實用實例》?電子工業(yè)出版社?2007 指導教師簽名： 年 月 日 教研室主任： 年 月 日 T C 1602B 01 0 W W W T I N S H A R P C O M T I NSHARP T C 1602B 01 V E R 00 S pe c i f i c a t i on F or A ppr ova l C u s t o m e r A p p r o v a l D a t e P r e p a r e d C h e c k A p p r o v a l D a t e D a t e D a t e T C 1602B 01 1 W W W T I N S H A R P C O M D e s c r i p t i o n R E V D E S C R E P T I O N D A T E V 00 F i r s t i s s ue D e c 01 2005T C 1602B 01 2 W W W T I N S H A R P C O M C O N T E N T S 1 S P E C I F I C A T I O N S 1 1 F e a t u r e s 1 2 B l o c k D i a g r a m 1 3 M e c h a n i c a l S p e c i f i c a t i o n s 1 4 A b s o l u t e M a x i m u m R a t i n g s 1 5 D C E l e c t r i c a l C h a r a c t e r i s t i c s 1 6 A C C h a r a c t e r i s t i c s 1 7 E l e c t r o O p t i c a l C h a r a c t e r i s t i c s 1 8 B a c k l i g h t C h a r a c t e r i s t i c s 2 MO D U L E S T R U C T U R E 2 1 I n t e r f a c e P i n D e s c r i p t i o n 2 2 F u n c t i o n D e s c r i p t i o n 2 3 R e s t F u n c t i o n 2 4 D i s p l a y D a t a R A M 3 R E L I A B I L I T Y 3 1 R e l i a b i l i t y t e s t c o n d i t i o n 3 2 Q u a l i t y G u a r a n t e e 3 3 I n s p e c t i o n m e t h o d 3 4 I n s p e c t i o n S t a n d a r d f o r S o l d e r 3 5 S c r e e n C o s m e t i c C r i t e r i a A p p e a r a n c e 3 6 P r e c a u t i o n s f o r u s i n g L C M M o d u l e s 3 7 I n s t a l l i n g L C M M o d u l e s 3 8 P r e c a u t i o n f o r H a n d i n g L C M M o d u l e s 3 9 E l e c t r o S t a t i c D i s c h a r g e C o n t r o l 3 10 P r e c a u t i o n f o r s o l d e r i n g t o t h e L C M 3 1 1 P r e c a u t i o n s f o r o p e r a t i o n 3 1 2 S t o r a g e 3 1 3 S a f e t y 3 1 4 L i m i t e d W a r r a n t y 3 1 5 R e t u r n L C M u n d e r w a r r a n t y 4 D A T E C O D E R U L E S 4 1 D a t e c o d e f o r s a m p l e 4 2 D a t e c o d e f o r p r o d u c t i o nT C 1602B 01 3 W W W T I N S H A R P C O M 1 S P E C I F I C A T I O N S 1 1 F E A T U R E S 1 2 B L O C K D I A G R A M I t e m C on t e n t s U n i t L C D T Y P E S T N T r a ns f l e c t i ve Y G L C D dut y 1 16 L C D bi a s 1 5 V i e w i ng di r e c t i on 6 o c l oc k O pe r a t i ng T e m pe r a t ur e 0 55 S t or a ge T e m pe r a t ur e 10 65 M odul e s i z e W x H x T 122 0 X 33 0 X 13 6 m m V i e w i ng a r e a W x H 99 0 X 13 0 m m D i s pl a y F or m a t 16 C ha r a c t e r s X 1 L i ne dot s C ha r a c t e r S i z e W x H 4 84 X 9 66 m m C ha r a c t e r pi t c h W x H 6 0 X 9 66 m mT C 1602B 01 4 W W W T I N S H A R P C O M 1 3 M E C H A N I C A L S P E C I F I C A T I O N 1 4 A B S O L U T E M A X I M U M R A T I N G S T a 25 N o t e S t r e s s e s b e y o n d t h o s e g i v e n i n t h e A b s o l u t e M a x i m u m R a t i n g t a b l e m a y c a u s e o p e r a t i o n a l e r r o r s o r d a m a g e t o t h e d e v i c e F o r n o r m a l o p e r a t i o n a l c o n d i t i o n s s e e A C D C E l e c t r i c a l C h a r a c t e r i s t i c s T C 1602B 01 5 W W W T I N S H A R P C O M 1 5 D C C H A R A C T E R I S T I C S V D D 3 5V t o 5 0V T A 25 N o t e F O S C 2 5 0 K H z V D D 3 0 V p i n E L R S R W D B 0 D B 7 a r e o p e n a l l o u t p u t s a r e n o l o a d s 1 6 A C C H A R A C T E R I S T I C S 1 W r i t e M ode W r i t i ng da t a f r om M P U t o S P L C 780 D T C 1602B 01 6 W W W T I N S H A R P C O M 2 R e a d M ode R e a di ng da t a f r om S P L C 780 D t o M P U 3 W r i t e M ode T i m i ng D i a gr a m W r i t i ng da t a f r om M P U t o S P L C 780 D 4 R e a d M ode T i m i ng D i a gr a m R e a di ng da t a f r om S P L C 780 D t o M P U T C 1602B 01 7 W W W T I N S H A R P C O M 1 7 E L E C T R O O P T I C A L C H A R A C T E R I S T I C ST C 1602B 01 8 W W W T I N S H A R P C O M 1 8 B A C K L I G H T C H A R A C T E R I S T I C S L C D M o d u l e w i t h L E D B a c k l i g h t A B S O L U T E M A X I M U M R A T I N G S T a 25 E L E C T R I C A L O P T I C A L C H A R A C T E R I S T I C S T a 25 I t e m S ym bol C ondi t i ons R a t i ng U ni t A bs ol ut e m a xi m um f or w a r d c ur r e nt I f m 150 m A P e a k f or w a r d c ur r e nt I f p I m a c c 脈沖 1 1 0 占空比 I m s e c p l u s 1 0 D u t y C y c l e 600 m A R e ve r s e vol t a ge V r 10 V P ow e r di s s i pa t i on P d 660 m W O pe r a t i ng T e m pe r a t ur e R a nge T O P r 30 70 S t or a ge T e m pe r a t ur e R a nge T s t g 40 80 I t e m S ym bol M i n T yp M a x U ni t C ondi t i ons F or w a r d V ol t a ge V f 4 0 4 2 4 4 V I f 100 m A R e ve r s e C ur r e nt I r 100 uA V r 10 V P e a k w a ve l e ngt h 570 nm I f 100 m A S pe c t r a l l i ne ha i r w i dt h 35 nm I f 100 m A L um i na nc e L v c d m 2 I f 100 m AT C 1602B 01 9 W W W T I N S H A R P C O M 2 M O D U L E S T R U C T U R E 2 1 I N T E R F A C E P I N D E S C R I P T I O N P i n N o S y m b o l L e v e l D e s c r i p t i o n 1 V S S 0V G r ound 2 V D D 5 0V S uppl y vol t a ge f or l ogi c 3 V 0 I nput f or a dj us t i ng t he L C D c ont r a s t 4 R S H L H D a t a s i gna l L I ns t r uc t i on s i gna l 5 R W H L H R e a d m ode L W r i t e m ode 6 E H L I t i s t he c l oc k l a t c h s i gna l i nput 7 D B 0 H L D a t a bi t 0 8 D B 1 H L D a t a bi t 1 9 D B 2 H L D a t a bi t 2 10 D B 3 H L D a t a bi t 3 1 1 D B 4 H L D a t a bi t 4 12 D B 5 H L D a t a bi t 5 13 D B 6 H L D a t a bi t 6 14 D B 7 H L D a t a bi t 7 15 A 5V L E D B a c k l i ght a node 16 K 0V L E D B a c k l i ght c a t hodeT C 1602B 01 1 0 W W W T I N S H A R P C O M 2 2 F U N C T I O N D E S C R I P T I O N O s c i l l at or S P L C 7 8 0 D o s c i l l a t o r s u p p o r t s n o t o n l y t h e i n t e r n a l o s c i l l a t o r o p e r a t i o n b u t a l s o t h e e x t e r n a l c l o c k o p e r a t i o n C on t r ol an d D i s p l ay I n s t r u c t i on s C o n t r o l a n d d i s p l a y i n s t r u c t i o n s a r e d e s c r i b e d i n d e t a i l s a s f o l l o w s 1 C l e ar D i s p l ay I t c l e a r s t h e e n t i r e d i s p l a y a n d s e t s D i s p l a y D a t a R A M A d d r e s s 0 i n A d d r e s s C o u n t e r 2 R e t u r n H om e X D o n o t c a r e 0 o r 1 I t s e t s D i s p l a y D a t a R A M A d d r e s s 0 i n A d d r e s s C o u n t e r a n d t h e d i s p l a y r e t u r n s t o i t s o r i g i n a l p o s i t i o n T h e c u r s o r o r b l i n k g o e s t o t h e m o s t l e f t s i d e o f t h e d i s p l a y t o t h e 1 s t l i n e i f 2 l i n e s a r e d i s p l a y e d T h e c o n t e n t s o f t h e D i s p l a y D a t a R A M d o n o t c h a n g e 3 E n t r y M od e S e t D u r i n g w r i t i n g a n d r e a d i n g d a t a i t d e f i n e s c u r s o r m o v i n g d i r e c t i o n a n d s h i f t s t h e d i s p l a y I D 1 I n c r e m e n t I D 0 D e c r e m e n t S 1 T h e d i s p l a y s h i f t S 0 T h e d i s p l a y d o e s n o t s h i f t 4 D i s p l ay O n O f f C on t r ol D 1 D i s p l a y o n D 0 D i s p l a y o f f C 1 C u r s o r o n C 0 C u r s o r o f f B 1 B l i n k s o n B 0 B l i n k s o f fT C 1602B 01 1 1 W W W T I N S H A R P C O M 5 C u r s or or D i s p l ay S h i f t W i t h o u t c h a n g i n g D D R A M d a t a i t m o v e s c u r s o r a n d s h i f t s d i s p l a y I D 1 I n c r e m e n t I D 0 D e c r e m e n t S 1 T he di s pl a y s hi f t S 0 T he di s pl a y doe s not s hi f t 6 F u n c t i on S e t X D o n o t c a r e 0 o r 1 D L I t s e t s i n t e r f a c e d a t a l e n g t h D L 1 D a t a t r a n s f e r r e d w i t h 8 b i t l e n g t h D B 7 0 D L 0 D a t a t r a n s f e r r e d w i t h 4 b i t l e n g t h D B 7 4 I t r e q u i r e s t w o t i m e s t o a c c o m p l i s h d a t a t r a n s f e r r i n g N I t s e t s t h e n u m b e r o f t h e d i s p l a y l i n e N 0 O n e l i n e d i s p l a y N 1 T w o l i n e d i s p l a y T C 1602B 01 1 2 W W W T I N S H A R P C O M F I t s e t s t h e c h a r a c t e r f o n t F 0 5 x 8 d o t s c h a r a c t e r f o n t F 1 5 x 1 0 d o t s c h a r a c t e r f o n t I t c a n n o t d i s p l a y t w o l i n e s w i t h 5 x 1 0 d o t s c h a r a c t e r f o n t 7 S e t C h ar ac t e r G e n e r at or R A M A d d r e s s I t s e t s C h a r a c t e r G e n e r a t o r R A M A d d r e s s a a a a a a 2 t o t h e A d d r e s s C o u n t e r C h a r a c t e r G e n e r a t o r R A M d a t a c a n b e r e a d o r w r i t t e n a f t e r t h i s s e t t i n g 8 S e t D i s p l ay D at a R A M A d d r e s s I t s e t s D i s p l a y D a t a R A M A d d r e s s a a a a a a a 2 t o t h e A d d r e s s C ount e r D i s pl a y da t a R A M c a n be r e a d or w r i t t e n a f t e r t hi s s e t t i ng I n one l i ne di s pl a y N 0 a a a a a a a 2 0 0 1 6 4 F 1 6 I n t w o l i n e d i s p l a y N 1 a a a a a a a 2 0 0 1 6 2 7 1 6 f o r t h e f i r s t l i n e a a a a a a a 2 4 0 1 6 6 7 1 6 f o r t h e s e c o n d l i n e 9 R e ad B u s y F l ag an d A d d r e s s W h e n B F 1 i t i n d i c a t e s t h e s y s t e m i s b u s y n o w a n d i t w i l l n o t a c c e p t a n y i n s t r u c t i o n u n t i l n o t b u s y B F 0 A t t h e s a m e t i m e t h e c o n t e n t o f A d d r e s s C o u n t e r a a a a a a a 2 i s r e a d 10 Wr i t e D at a t o C h ar ac t e r G e n e r at or R A M or D i s p l ay D at a R A M I t w r i t e s d a t a d d d d d d d d 2 t o c h a r a c t e r g e n e r a t o r R A M o r d i s p l a y d a t a R A M 11 R e ad D at a f r om C h ar ac t e r G e n e r at or R A M or D i s p l ay D at a R A M I t r e a d s d a t a d d d d d d d d 2 f r o m c h a r a c t e r g e n e r a t o r R A M o r d i s p l a y d a t a R A M T o r e a d d a t a c o r r e c t l y d o t h e f o l l o w i n g T C 1602B 01 1 3 W W W T I N S H A R P C O M 1 T h e a d d r e s s o f t h e C h a r a c t e r G e n e r a t o r R A M o r D i s p l a y D a t a R A M o r s h i f t t h e c u r s o r i n s t r u c t i o n 2 T h e R e a d i n s t r u c t i o n 8 B i t op e r at i on an d 8 d i gi t 1 l i n e d i s p l ay u s i n g i n t e r n al r e s e t T C 1602B 01 1 4 W W W T I N S H A R P C O M 4 B i t op e r at i on an d 8 d i gi t 1 l i n e d i s p l ay u s i n g i n t e r n al r e s e t 8 B i t O p e r at i on an d 8 D i gi t 2 L i n e D i s p l ay U s i n g I n t e r n al R e s e t T C 1602B 01 1 5 W W W T I N S H A R P C O M 2 3 R E S E T F U N C T I O N A t p o w e r o n S P L C 7 8 0 D s t a r t s t h e i n t e r n a l a u t o r e s e t c i r c u i t a n d e x e c u t e s t h e i n i t i a l i n s t r u c t i o n s T h e i n i t i a l p r o c e d u r e s a r e s h o w n a s f o l l o w s T C 1602B 01 1 6 W W W T I N S H A R P C O MT C 1602B 01 1 7 W W W T I N S H A R P C O M 2 4 D I S P L A Y D A T A R A M D D R A M T he 80 bi t D D R A M i s nor m a l l y us e d f or s t or i ng di s pl a y da t a T hos e D D R A M not us e d f or di s pl a y da t a c a n be us e d a s ge ne r a l da t a R A M I t s a ddr e s s i s c onf i gur e d i n t he A ddr e s s C ount e r T i m i n g G e n e r at i on C i r c u i t T h e t i m i n g g e n e r a t i n g c i r c u i t i s a b l e t o g e n e r a t e t i m i n g s i g n a l s t o t h e i n t e r n a l c i r c u i t s I n o r d e r t o p r e v e n t t h e i n t e r n a l t i m i n g i n t e r f a c e t h e M P U a c c e s s t i m i n g a n d t h e R A M a c c e s s t i m i n g a r e g e n e r a t e d i n d e p e n d e n t l y L C D D r i ve r C i r c u i t T o t a l o f 1 6 c o m m o n s a n d 4 0 s e g m e n t s s i g n a l d r i v e r s a r e v a l i d i n t h e L C D d r i v e r c i r c u i t W h e n a p r o g r a m s p e c i f i e s t h e c h a r a c t e r f o n t s a n d l i n e n u m b e r s t h e c o r r e s p o n d i n g c o m m o n s i g n a l s o u t p u t d r i v e w a v e f o r m s a n d t h e o t h e r s s t i l l o u t p u t u n s e l e c t e d w a v e f o r m s T h e r e l a t i o n s h i p s b e t w e e n D i s p l a y D a t a R A M A d d r e s s a n d L C D s p o s i t i o n a r e d e p i c t e d a s f o l l o w s C h ar ac t e r G e n e r at or R O M C G R O M U s i ng 8 bi t c ha r a c t e r c ode t he c ha r a c t e r ge ne r a t or R O M ge ne r a t e s 5 x 8 dot s or 5 x 10 dot s c ha r a c t e r pa t t e r ns I t a l s o c a n ge ne r a t e 192 s 5 x 8 dot s c ha r a c t e r pa t t e r ns a nd 64 s 5 x 10 dot s c ha r a c t e r pa t t e r ns C h ar ac t e r G e n e r at or R A M C G R A M U s e r s c a n e a s i l y c ha nge t he c ha r a c t e r pa t t e r ns i n t he c ha r a c t e r ge ne r a t or R A M t hr ough pr ogr a m I t c a n be w r i t t e n t o 5 x 8 dot s 8 c ha r a c t e r pa t t e r ns or 5 x 10 dot s f or 4 c ha r a c t e r pa t t e r ns T he f ol l ow i ng di a gr a m s how s t he S P L C 780D c ha r a c t e r pa t t e r ns C or r e s ponde nc e be t w e e n C ha r a c t e r C ode s a nd C ha r a c t e r P a t t e r ns T C 1602B 01 1 8 W W W T I N S H A R P C O M T h e r e l a t i o n s h i p s b e t w e e n C h a r a c t e r G e n e r a t o r R A M A d d r e s s e s C h a r a c t e r G e n e r a t o r R A M D a t a c h a r a c t e r p a t t e r n s a n d C h a r a c t e r C o d e s a r e d e p i c t e d a s f o l l o w s T C 1602B 01 1 9 W W W T I N S H A R P C O M 5 x 8 d ot c h ar ac t e r p at t e r n s N o t e 1 I t m e a n s t h a t t h e b i t 0 2 o f t h e c h a r a c t e r c o d e c o r r e s p o n d t o t h e b i t 3 5 o f t h e C G R A M a d d r e s s N o t e 2 T h e s e a r e a s a r e n o t u s e d f o r d i s p l a y b u t c a n b e u s e d f o r t h e g e n e r a l d a t a R A M N o t e 3 W h e n a l l o f t h e b i t 4 7 o f t h e c h a r a c t e r c o d e a r e 0 C G R A M c h a r a c t e r p a t t e r n s a r e s e l e c t e d N o t e 4 1 S e l e c t e d 0 N o s e l e c t e d X D o n o t c a r e 0 o r 1 N o t e 5 F o r e x a m p l e 1 s e t c h a r a c t e r c o d e b 2 b 1 b 0 0 b 3 0 o r 1 b 7 b 4 0 t o d i s p l a y T T h a t m e a n s c h a r a c t e r c o d e 0 0 1 6 a n d 0 8 1 6 c a n d i s p l a y T c h a r a c t e r N o t e 6 T h e b i t s 0 2 o f t h e c h a r a c t e r c o d e R A M i s t h e c h a r a c t e r p a t t e r n l i n e p o s i t i o n T h e 8 t h l i n e i s t h e c u r s o r p o s i t i o n a n d d i s p l a y i s f o r m e d b y l o g i c a l O R w i t h t h e c u r s o r 5 X 1 0 d o t c h a r a c t e r p a t t e r n sT C 1602B 01 2 0 W W W T I N S H A R P C O M N o t e 1 I t m e a n s t h a t t h e b i t 1 2 o f t h e c h a r a c t e r c o d e c o r r e s p o n d t o t h e b i t 4 5 o f t h e C G R A M a d d r e s s N o t e 2 T h e s e a r e a s a r e n o t u s e d f o r d i s p l a y b u t c a n b e u s e d f o r t h e g e n e r a l d a t a R A M N o t e 3 W h e n a l l o f t h e b i t 4 7 o f t h e c h a r a c t e r c o d e a r e 0 C G R A M c h a r a c t e r p a t t e r n s a r e s e l e c t e d N o t e 4 1 S e l e c t e d 0 N o s e l e c t e d X D o n o t c a r e 0 o r 1 N o t e 5 F o r e x a m p l e 1 s e t c h a r a c t e r c o d e b 2 b 1 0 b 3 b 0 0 o r 1 b 7 b 4 0 t o d i s p l a y U T h a t m e a n s a l l o f t h e c h a r a c t e r c o d e s 0 0 1 6 0 1 1 6 0 8 1 6 a n d 0 9 1 6 c a n d i s p l a y U c h a r a c t e r N o t e 6 T h e b i t s 0 3 o f t h e c h a r a c t e r c o d e R A M i s t h e c h a r a c t e r p a t t e r n l i n e p o s i t i o n T h e 1 1 t h l i n e i s t h e c u r s o r p o s i t i o n a n d d i s p l a y i s f o r m e d b y l o g i c a l O R w i t h t h e c u r s o r C u r s or B l i n k C on t r ol C i r c u i t T h i s c i r c u i t g e n e r a t e s t h e c u r s o r o r b l i n k i n t h e c u r s o r b l i n k c o n t r o l c i r c u i t T h e c u r s o r o r t h e b l i n k a p p e a r s i n t h e d i g i t a t t h e D i s p l a y D a t a R A M A d d r e s s d e f i n e d i n t h e A d d r e s s C o u n t e r T C 1602B 01 2 1 W W W T I N S H A R P C O M I n t e r f ac i n g t o M P U T h e r e a r e t w o t y p e s o f d a t a o p e r a t i o n s 4 b i t a n d 8 b i t o p e r a t i o n s U s i n g 4 b i t M P U t h e i n t e r f a c i n g 4 b i t d a t a i s t r a n s f e r r e d b y 4 b u s l i n e D B 4 t o D B 7 T h u s D B 0 t o D B 3 b u s l i n e s a r e n o t u s e d U s i n g 4 b i t M P U t o i n t e r f a c e 8 b i t d a t a r e q u i r e s t w o t i m e s t r a n s f e r r i n g F i r s t t h e h i g h e r 4 b i t d a t a i s t r a n s f e r r e d b y 4 b u s l i n e f o r 8 b i t o p e r a t i o n D B 7 t o D B 4 S e c o n d l y t h e l o w e r 4 b i t d a t a i s t r a n s f e r r e d b y 4 b u s l i n e f o r 8 b i t o p e r a t i o n D B 3 t o D B 0 F o r 8 b i t M P U t h e 8 b i t d a t a i s t r a n s f e r r e d b y 8 b u s l i n e s D B 0 t o D B 7 W h e n t h e A d d r e s s C o u n t e r i s 0 7 1 6 t h e c u r s o r p o s i t i o n i s s h o w n a s b e l o w R E G I S T E R I R I n s t r u c t i on R e gi s t e r an d D R D at a R e gi s t e r S P L C 7 8 0 D c o n t a i n s t w o 8 b i t r e g i s t e r s I n s t r u c t i o n R e g i s t e r I R a n d D a t a R e g i s t e r D R U s i n g c o m b i n a t i o n s o f t h e R S p i n a n d t h e R W p i n s e l e c t s t h e I R a n d D R s e e b e l o w T h e I R c a n b e w r i t t e n b y M P U b u t i t c a n n o t b e r e a d b y M P U B u s y F l ag B F W h e n R S 0 a n d R W 1 t h e b u s y f l a g i s o u t p u t t o D B 7 A s t h e b u s y f l a g 1 S P L C 7 8 0 D i s i n b u s y s t a t e a n d d o e s n o t a c c e p t a n y i n s t r u c t i o n u n t i l t h e b u s y f l a g 0 T C 1602B 01 2 2 W W W T I N S H A R P C O M A d d r e s s C ou n t e r A C T h e A d d r e s s C o u n t e r a s s i g n s a d d r e s s e s t o D i s p l a y D a t a R A M a n d C h a r a c t e r G e n e r a t o r R A M W h e n a n i n s t r u c t i o n f o r a d d r e s s i s w r i t t e n i n I R t h e a d d r e s s i n f o r m a t i o n i s s e n t f r o m I R t o A C A f t e r w r i t i n g t o r e a d i n g f r o m D i s p l a y D a t a R A M o r C h a r a c t e r G e n e r a t o r R A M A C i s a u t o m a t i c a l l y i n c r e m e n t e d b y o n e o r d e c r e m e n t e d b y o n e T h e c o n t e n t s o f A C a r e o u t p u t t o D B 0 D B 6 w h e n R S 0 a n d R W 1 I O P or t C on f i gu r at i on I n p u t p or t E I n p u t p or t R W R S O u t p u t p or t C L 1 C L 2 M DT C 1602B 01 2 3 W W W T I N S H A R P C O M I n p u t O u t p u t p or t D B 7 D B 0 M P U a nd M odul e C onne c t